STEM Professionals Blog - GLOBE International STEM Network

Scientists are wondering what is happening over Antarctica and where are the noctilucent clouds. Noctilucent clouds or polar mesospheric clouds are the highest occurring cloud types (form about 50 miles or 80 Km above the Earth's surface). They form in the Mesosphere and are thin clouds made up of ice crystals that form from left over fine dust from meteors. Because they are so high up in the sky, you see them when the sun is low or almost nighttime. The form during the summer months over the north and south poles. That is when it is coldest that high up in the sky (in the...

Santa Fe Indian School Café Scientifique presents Marilé Colón Robles, a NASA scientists to share how you can become a citizen scientist and help NASA Learn how to do cloud observations with: Marilé Colón Robles, Project Scientist for NASA Globe Clouds CLICK HERE TO REGISTER Café Description: Marilé Colón Robles, Project Scientist for NASA GLOBE Clouds Science Systems and Applications, Inc. will be presenting information about cloud and aerosol data that NASA uses and how you as a citizen scientist can help in the collection of this data. Please register to the event using your school...

septiembre/octubre/noviembre 2020 Nuevos recursos disponibles Gracias a nuestra comunidad de nubes, el reto comunitario de nubes 2020 fue un gran éxito al mostrar cómo la ciencia es mejor juntos. Recibimos excelentes fotografías y obras de artes de los participantes, algunas de las cuales se destacaron en el video de agradecimiento. Si no pudistes participar del reto o quieres seguir trabajando en él, visita la página de la guía para familias de nubes GLOBE para obtener los recursos. Encontrarás vídeos sobre la ciencias de nubes (inglés) y el reto para Familias sobre...

September/October/November 2020   Cloud Challenge Resources Available Thanks to our cloud community, the 2020 Community Cloud Challenge was a great success showing how Science is Better Together! We received some great photos and artwork from participants, some of which were highlighted in the thank you video. If you missed the challenge or want to keep working on it, visit the GLOBE Clouds Family Guide page for the resources. You will find videos about the Science of Clouds and the Family Cloud Challenge page with a Choice Chart for activities...

Audiencia: ¡Todos! (Estudiantes y maestros de todos los grados, educadores informales y el público en general) Fechas: 15 de julio de 2020 - 15 de agosto de 2020 Cómo Participar: Disfruta del verano descubriendo las nubes desde una nueva perspectiva. Hay muchas formas de participar. Cada jueves puedes aprender más sobre las nubes con científicos y educadores de la NASA por medio de la página NASA Earth’s Facebook page. También puedes hacer actividades en casa o hacer observaciones de las nubes o el cielo a través de la herramienta Nubes en GLOBE o la aplicación GLOBE Observer app. ¡Todo...

Audience: Everyone! (Students and teachers all grade levels, informal educators, and the general public) Dates: July 15, 2020 - August 15, 2020 How to Participate: Spend summer together by discovering clouds from a new perspective. There are many ways to participate. Learn more about clouds with NASA scientists and educators each Thursday on NASA Earth’s Facebook page, do at-home activities, or take cloud or sky observations through the Clouds tool on GLOBE or the GLOBE Observer app. It is all up to you! Show how you took part in this unique event by sharing on social media. Choose...

The EPA is celebrating Air Quality Week (May 4-8) and the GLOBE Clouds team would like to ask everyone again for your photographs of dust events! We got a chance to chat with Anne Semrau, a biology teacher at New Mexico State University, who sent in some amazing photographs of a dust event. Question: Where are you from? Where do you live now? Answer: I am mostly from Texas (different parts: Dallas, Houston, Austin, rural northeast Texas) but I have lived in several other places (Navajo Nation, California, Montana, New Hampshire, Massachusetts, Missouri, Washington DC).   ...

The NASA GLOBE Clouds team has put together a family guide filled with activities and resources great to do as a family from your home.   El equipo NASA GLOBE nubes ha preparado una guía para familias llena de actividades y recursos tremendas para realizar haceren family en tu hogar.   Guide in English (Link). Guía en español (Enlace).    

La Sra. Tina Rogerson es la programadora científica y analista para el equipo NASA GLOBE nubes en el Centro de Investigaciones Langley de la NASA en Hampton, Virginia con la compañía SSAI. Tina analiza tus observaciones de nubes y del cielo y escribe código de computadoras para realizar la correspondencia con data de satélites. Ella también está encargada de manejar todos los mensajes electrónicos de la NASA y se asegura que te lleguen por cada observación de nubes.   Pregunta: ¿De dónde eres? Respuesta: Yo soy de Poquoson, Virginia un pueblo pequeño en la costa este de los...

March/April/May 2020   What is NASA GLOBE Clouds? Cloud observations through The GLOBE Program are led by the NASA GLOBE Clouds Team at NASA Langley Research Center in Hampton, VA. Every sky and cloud observation submitted through GLOBE Clouds, including through the GLOBE Observer app, is analyzed by the team to determine if it matches satellite data. If there is a match, a personalized NASA email is sent to you comparing your observations with satellites. Your observations and photographs help researchers better understand our atmosphere and how to make satellite data...

The GLOBE Fall Cloud Observation Challenge brought in more than 45,000 observations from citizen scientists in more than 17,000 locations in 93 countries on every continent — including Antarctica. This influx of cloud observations is super helpful to NASA scientists who work with geostationary satellites and the suite of satellite instruments known as the Clouds and the Earth's Energy Radiant System (CERES). By comparing geostationary and CERES observations from a particular area to data submitted by citizen scientists, scientists can differentiate between wispy cirrus clouds and cold,...

  A new article is now available on the National Science Teachers Association (NSTA) Science Scope journal geared for middle school teachers on ways to integrate using the GLOBE Observer app in the classroom and take cloud observations. The article titled "Making Science Come Alive with Clouds" features GLOBE superstar educators Mr. Jeffrey Bouwman (Shumate Middle School in Gibraltar, Michigan, USA) and Dr. Caryn Smith-Long (Montverde Academy, Montverde, Florida, USA) as they share their classroom technology expertise and how they use the app with their students.    ...

Story published on https://spaceweather.com/ on 10/29/2019. A sharable version of this story is available here. You can also look at Realtime Sprite Photo Gallery. Image Credit - Chris Holmes.   This is the picture that captured everyone's attention! It is a photograph of a gigantic jet as observed by pilot Chris Holmes as he traveled at 35,000 ft over the Gulf of Mexico near the Yucatan Peninsula. He noticed the big thunderstorm (or cumulonimbus cloud) producing lots of lightning with sprites and jets.    Gigantic jets, sometimes...

Purple Skies observed Dallas, TX on October 27, 2019. Purple skies during sunsets and sunrises (blog explaining science) have been observed by our GLOBE participants! Thank you to all those sending in their observations and participating of the Fall Clouds Challenge!    Educator Angie Rizzi, part of the Science Education team at NASA Langley Research Center in Hampton, VA, created this lesson for teachers who want to use this event to talk about aerosols and sky color. The activity incorporates the Elementary GLOBE Sky Observers activity with photographs of the observed...

Picture by Jan Curtin @ Vail, AZ (https://spaceweathergallery.com/indiv_upload.php?upload_id=156718) Raikoke Volcanic Eruption Have you noticed purple sunrises or sunsets where you live? Submit your photographs to GLOBE or GLOBE Observer, especially as we get ready to start the Fall Cloud Challenge: What's Up in Your Sky (Oct 15 - Nov 15, 2019)! People around the world have been noticing purple skies at dawn and at dusk, calling it the Raikoke Sunsets (see photographs submitted). The purple color is because of sulfurous gas that was launched into...

NASA está solicitando tu ayuda para determinar “¿Qué ves en tu cielo?” El equipo NASA GLOBE nube quiere estudiar diferencias en nubes y aerosoles. La data colectada durante este reto del otoño en el hemisferio norte o primavera en el hemisferio sur será comparada con los resultados obtenidos durante el reto de primavera del 2018. Puedes ayudar sometiendo observaciones de nubes, polvo atmosférico, calina, o humo (límite 10 por día) a GLOBE usando cualquiera de las opciones de entrada de datos, incluyendo la aplicación móvil GLOBE Observer. Los participantes GLOBE y GLOBE...

Tú puedes reportar el cielo como 100% cubierto u obscurecido usando el protocolo de nubes en GLOBE y en la aplicación GLOBE Observer. ¿Cuál es la diferencia? Este blog tiene consejos para ayudarte. Todas las fotografías en este blog fueron colectadas por observadores como tú. ¡Gracias! Al principio encontré la diferencia entre cubierto y obscurecido algo confuso, pero cuando entendí el significado de ambas, pude mejorar mis observaciones. Empecemos con definir ambos términos:   Cubierto – Noventa por ciento o más del cielo está cubierto por nubes. En esta situación vez bien poco o...

Audience: Everyone! (Students and teachers all grade levels, informal educators, and the general public) Dates: October 15, 2019 - November 15, 2019 Observations: Clouds and aerosols (dust storms, haze, smoke). Limit 10 per day. NASA is requesting your help to determine “What’s up in your Sky”. The GLOBE Clouds team wants to study differences in clouds and aerosols. The data collected during this fall challenge will be compared to results from the 2018 Spring Clouds Challenge. Help by submitting clouds, dust, haze or smoke observations (limit of 10 per day) to GLOBE using any of...

In the GLOBE Clouds protocol and GLOBE Observer app, you can report if your sky is “overcast” or “obscured”. But what’s the difference? Below are some tips to help! All the photographs featured were collected by observers just like you - Thank you! I found “obscured” and “overcast” very confusing at first, but when I understood what they meant, things made much more sense. Let’s start by defining them: Overcast – The sky is completely covered by clouds (cloud cover greater than 90%). This means that you will see little or no blue sky. When it’s overcast, you are looking at stratus...

Do you live in an area that has dust storms? The Global Learning and Observations to Benefit the Environment Program (GLOBE) team would like you to photograph dust events in your area and submit your photos using the GLOBE Observer app.   Join NASA GLOBE Clouds Project Scientist, Marilé Colón Robles, to learn more about how to collect your observations and educational resources you can use with formal and informal audiences. Your observations will be used by scientists to verify satellite observations and see if their models have successfully predicted these dust storms...

The NASA GLOBE Clouds team is looking for members of the GLOBE International STEM Network (GISN) or any researcher that would be interested in publishing research (as lead or co-author) using the GLOBE Clouds data.  We are looking for researchers that are interested in: Cryosphere that would be willing to use cloud observations over the Arctic/Antarctica. Satellite validation studies with collocated observations, particularly those collected during GLOBE Clouds Data Challenge (March 15-April 15, 2018). Natural hazards to explore possibilities of using the...

I just updated HoloGLOBE to v1.0.2. For those of you new to this app, HoloGLOBE brings NASA and NOAA visualizations of the Earth to the palm of your hand through augmented reality (AR). You can read more about the app here: http://www.palmyracove.org/InstituteforEarthObservations/HoloGLOBE.aspx In this latest release, I have added play/pause functionality to the MyNASAData module. The MyNASAData is essentially an augmented reality version of GLOBE's Earth System Poster. In addition the new ICESat-2 module has been added. The ICESat-2 module was built by Emme Wiederhold, a student at...

From the start, the measurement of daily maximum and minimum air temperature within one hour of local solar noon has been a key GLOBE protocol. The low cost approach was to use a U-tube thermometer housed in a wooden instrument shelter facing away from the equator. The U-shaped tube contained mercury with pins on either side of the mercury. As the air temperature warmed the pin on one side would move while the other pin stayed in place; when the air cooled, the pin on the other side would be pushed up. The pins were held in place by magnetized strips behind the thermometer tube so that they...

As Earth science has a single uncontrolled object of study, the first rule is to take today’s data today. While ice and sediment cores and fossils can reveal past conditions, the observations that can be made right now cannot be replaced by ones taken later. This goes well with the Native American adage, “You can’t step in the same river twice.” The environment is constantly changing and doing so on a wide range of time and space scales. In a recent video post, Neil deGrasse Tyson said, “One of the great things about science is that it is an entire exercise finding what is true. You have...

Concerns regarding the impact of global warming on vector-borne diseases have intensified interest in the relationship between atmospheric factors and dengue fever incidence. Global climate change poses the threat of serious social upheaval, population displacement, economic hardships, and environmental degradation. Changes in temperature, rainfall and relative humidity have potential to enhance vector development, reproductive and biting rates, shorten pathogen incubation period and encourage adult longevity. In addition, changes in wind direction, velocity and frequency will have an...

Beste mensen, Het effect van de uitzonderlijk zachte winter op de natuur is ook bij de media niet onopgemerkt gebleven. In de uitzending van het KRO programma Brandpunt op zondag 16 maart komt het onderwerp aan bod. Zie http://gemi.st/KN_1656575. Het item begint op 23:20. Verder zat ik op zondag 9 maart in het programma Jinek op Zondag. Dit is terug te zien op http://gemi.st/KN_1656819. Tenslotte zat ik op woensdag 19 maart in het EO-programma 'Melk en Honing'. De uitzending is terug te bekijken op http://gemi.st/EO_101212300 . Vriendelijke groeten, Arnold

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2013/03/06/connecting-pollutants-and-air-temperature-in-the-maldives/ With climate change, there are many relationships that are understood, and many others that are not.  Dr. Veerabhadran Ramanathan from The Scripps Institute in San Diego has spent the last fifteen years in the Maldives, a nation south of India that is comprised of over 1,200 islands, studying the relationship between air pollutants, cloud formation and air temperature. The Maldives are a great location for such an...

A couple of years ago, I attended a seminar sponsored by the Climate and Global Dynamics Division (CGD) of the National Center for Atmospheric Research (NCAR) on how climate change is threatening the survival of wolverines (Gulo gulo).  This scientist, Synte Peacock from CGD, painted a gloomy outlook for this ferocious creature after using a climate model to examine changes in spring snow cover and summer air temperatures.    However, recent legislative proposals may make the future a little brighter.   A wolverine. Photo Credit: Steve...

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2013/01/30/an-interesting-relationship-soil-temperature-and-climate-change/ It seems common place that warmer air temperature leads to warmer soil temperature. And while this relationship seems intuitive, the effect isn’t always studied, especially with respect to the response from microorganisms. That is why researchers are investigating what happens when the soil temperature increases. An intricate network of soil microorganisms From: Commonwealth Scientific and Industrial Research...

Blog originally posted on the GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2013/01/23/trees-in-trouble-what-affect-does-tree-mortality-have-on-climate-change/ Through our trees in trouble series, we’ve examined trees in the Sahel zone in Africa and the United States.  This problem, climate change and dying trees, has been seen on every continent, the only exception being Antarctica, due to the lack of vegetation on the frozen continent.  Scientists have recently found that there is an alarming loss rate of big, old trees, whose ages range from 100-300+ years, in...

Blog previously posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2013/01/16/a-tale-of-two-extremes/ Weather extremes have become a common theme in the news headlines the past few weeks. For example, nearly every part of the United States has been experiencing one of two extremes – either frigid cold or record-breaking high temperatures. Places like Arizona and California experienced below-freezing temperatures, which can have potential impacts on the crops grown in these typically balmy regions. In contrast, cities in the Southeast U.S., such as Atlanta, Georgia,...

Blog originally posted on the GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/12/19/the-chicken-and-egg-story-of-global-warming-and-extreme-droughts-a-lesson-on-climate-feedbacks/ I recently read that the extreme drought in western North America during 2000-2004 actually resulted in more carbon dioxide being released into the atmosphere. In the article in Nature Geoscience, it explained that such droughts can further enhance global warming. When a drought occurs, the plants wither and die and no longer uptake carbon dioxide (normally living plants serve as a carbon sink...

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/11/14/esno-basics-what-is-it/ Through many posts here on the Scientists’ Blog, we, in one way or another, discuss ENSO.  ENSO, or El Niño-Southern Oscillation, is a quasi-periodic climate pattern that occurs in the tropical Pacific Ocean.  When the conditions change, the atmosphere responds in many different ways.  In certain locations, it is cloudier and it rains more, while in others it’s clear and dry.  Through our “ENSO Basics” series, we’ll take a look at ENSO in many...

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/11/08/non-stationarity-new-vocabulary-for-a-changing-climate/ A few years ago I attended a workshop for early career scientists to discuss frontiers in integrated water-climate-society vulnerability and adaptation science. This interdisciplinary area of science focuses on the need for using scientific information to not only identify communities that are vulnerable to climate change, but to also help create effective approaches for communities to adapt to climate change. Since every society...

Blog originally posted on the GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/11/01/full-circle-superior-part-iv-changing-superior-changing-industry/ This week we pick back up on our Full Circle Superior Series.  In 2010 Mike Link and Kate Crowley chose to walk around the largest fresh water lake in the world – Lake Superior which has shoreline in both Canada and the United States. This 1555 mile/145 day walk was the first ever by a couple and the first to attempt to stay on the shoreline. Because Mike and Kate are educators in their sixties they wanted to deliver...

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/10/05/xpedition-review-reflections-back-and-looking-ahead/ To say that the journey to the summit of Mt. Kilimanjaro was a success would not do justice to the wonderful personal and scientific experiences the team had.  From taking the first steps toward the summit on Sunday 23 September to summiting the following week and boarding flights to return home, each team member gained something that will stay with them forever. Collecting data in the rainforest Collecting hydrology...

Blog originally posted on the GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/10/04/xpedition-day-ten-mweka-camp-to-park-gate/ Monday, 1 October was the final day of The Xpedition. After an exciting summit day, the team continues on their descent and is picked up to head back to Arusha, where they will enjoy a well-deserved meal. Unloading the equipment after a successful trip  Throughout the entire journey, the team relied on the use of porters, who are local Tanzanians who carry equipment up the mountain. These porters are essential to a successful...

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/10/03/xpedition-day-nine-special-crater-camp-to-summit-to-mweka-camp/ On Sunday, 30 September, the team made it to the summit of Mt. Kilimanjaro. The summit sits at 5,895 m (19,340 ft) above sea level. What a fantastic accomplishment for the team!   Team at the summit Hiking on a glacier near the summit After the team spendt time celebrating their success, they began their descent, stopping at 3,200 m (10,498 ft) at Mweka Camp. To celebrate the summit, the bloggers were...

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/10/01/xpedition-day-eight-kosovo-camp-to-special-crater-camp/ As you may have noticed, the Scientist Blog was quiet for the past two days.  As is to be expected, things can change rapidly on the mountain and the ability for the team to send us their daily blogs was interrupted.  The team safely continued on their journey, and have sent us their blogs. Day Eight was Saturday, 29 September.  The team journeyed from 4,877 m (16,000 ft) to 5,608 m (18,399 ft).  This portion of...

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/09/28/xpedition-day-seven-karanga-camp-to-kossovo-camp/ Today the team continues on their journey to the summit of Mt. Kilimanjaro by traveling from the Karanga Camp, situated at 3,962 m (12,998 ft), to the Kossovo Camp at 4,877 m (16,000 ft). This leg of the journey takes the team back to the alpine desert biome. Part of the team stops for a photo While this biome is found on Mt. Kilimanjaro, it is also found in many other mountain ranges, including but not limited to the Rocky...

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/09/27/xpedition-day-six-lava-tower-to-karanga-camp/ A morning at camp  The team is now over halfway done with their trek to the summit of Mt. Kilimanjaro in Tanzania.  The journey began on Sunday 23 September as the team left Basecamp and hiked to Forest Camp.  You can read all about their journey starting here. A view of Mt. Kilimanjaro from the trail  Today’s part of the trek up Kilimanjaro takes the team back down in elevation, from 4,632 m to 3,962...

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/09/26/xpedition-day-five-moir-hut-to-lava-tower/ Today marks another transition between biomes – from heath zone to alpine desert.  An alpine desert is a harsh, dry, windy region that consists of mostly bare rock and ice.  Temperatures during the day can soar to 38°C, while at night can be below freezing.  The air is very thin, which results in labored breathing as well as more intense solar radiation.  The Lava Tower camp sits at approximately 5,029 m (16,499 ft). ...

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/09/25/xpedition-day-four-shira-1-camp-to-moir-hut/ Today the team will hike from Shira 1 Camp to Moir Hut (Shira 2 Camp on the map below).  This part of the journey will take the team further into the heath zone.  As discussed yesterday, the heath zone is a zone of sparse vegetation due to lower rainfall amounts.   The route the team is taking: the western approach route The team stops for a discussion about soils Today’s question focuses on the protocols that...

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/09/24/xpedition-day-three-forest-camp-to-shira-1-camp/ Today the team heads from 2,438 m to 3,505 m above sea level.  This portion of the journey will take the team from rain forest to heath zone.  A rain forest is characterized by high rainfall, with annual totals ranging from 1750-2000 mm (68-78 in).  A heath zone is above the forest line, where porous soils and lower rainfall result in sparser vegetation. Leaving the rain forest heading to the heath zone ...

Blog originally posted on The GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/09/23/xpedition-day-two-basecamp-to-forest-camp/ Packed and ready for the journey   Today, Sunday, 23 September, the team packs up the vehicles and heads off on their journey.  Their itinerary for the day includes a few hours’ drive from basecamp followed by a 3 hour hike to Forest Camp, located at 2,438 m above sea level. Taking a quick break on the hike   The bloggers were asked the following question as they set off on their journey:  Did you do...

Blog originally posted on the GLOBE Scientists' Blog: http://blog.globe.gov/sciblog/2012/09/19/students-teachers-and-scientists-explore-mt-kilimanjaro-through-globe-protocols-and-blogs/ Beginning on 23 September, five GLOBE students, teachers and scientists and one GLOBE alum will join commence on a journey through the biomes of Mt. Kilimanjaro in Tanzania, Africa. Known as, “the Xpedidion,” the 2012 trek marks the fifth year of this exciting journey. This year will be bigger than ever as a documentary film crew will join us. In addition, we will be sharing images via social media...

This post is the second in a series called “Trees in Trouble”.  To see the first post in this series click here. Climate impacts so many things on this planet, most notably the types of flora and fauna that live in a specific region.  And for those creatures that have annual cycles tied to the local climate, such as the hibernation of bears, migration of birds, and life cycles of insects, a change in climate can shift their way of life and even have subsequent consequences on the environment they live in. Take the pine beetle (Dendroctonus ponderosae) for example.  In...

Many of the world’s glaciers, such as the Exit Glacier in Alaska, United States and Pasterze Glacier in Austria, have lost mass due to melting over the past few years. One such glacier, Exploradores in southern Chile, is also disappearing.  This glacier is a sight to behold – a 20 kilometer frozen mass that is filled with cliffs of luminescent blue and indigo ice. A view from inside the Exploradores Glacier, from Nature A view from inside the Exploradores Glacier, from Nature The Exploradores Glacier is one of many glaciers in the Patagonian Ice Fields located in the...

Since the end of January 2012, Europe has been experiencing record-breaking cold temperatures and heavy snowfalls.  Temperatures are dropping to -40°C (-40°F) and below in Europe.  The canals of Venice are freezing over (the first time since 1991) and sections of the Black Sea have frozen (the first time since 1977).  And, Rome has received its first substantial snowfall since 1986. A small boat cuts through the ice along a canal in Venice. Photo by Marco Sabadin/AFP/Getty Images The frozen Black Sea in Ukraine (Reuters photo) So, why is it so cold...

Communities in the Sahel region of Africa depend on trees for firewood, food, building materials, and even medicine.  Anecdotal observations in this savannah climate, a transition region to the south of the Sahara Desert, have suggested the number of trees is decreasing.  A recent study by a group of researchers at the University of California at Berkeley has provided scientific support indicating that trees are indeed dying and the decline is being attributed to climate change.  Scientists looked at aerial photos dating back to 1954, satellite images, climate change...