In fall 2025, more than 50 educators and over 1,500 young people across Maine and New Hampshire participated in NASA’s Global Learning and Observation to Benefit the Environment (GLOBE) Green Down, a citizen science (also known as participatory science or community science) initiative that engages students and volunteers in tracking seasonal changes in plant life. By observing and documenting leaf color change and leaf drop, participants contributed valuable data used by scientists studying how ecosystems respond to a changing climate.

GLOBE Green Down is part of NASA’s Global Learning and Observation to Benefit the Environment (GLOBE) Program, which connects students, educators, and the public with authentic scientific research. Using a standardized color guide and observation protocols, participants measured changes in plant health as autumn progressed, generating consistent, high-quality data that can be analyzed alongside observations collected worldwide.

The 2025 field season was led by the Gulf of Maine Research Institute and focused on supporting educators in taking learning outdoors while strengthening students’ scientific observation and data literacy skills. Students from pre-kindergarten through high school studied a wide range of tree species—including maple, oak, birch, ash, beech, poplar, and apple—by making repeated observations in their local environments.

In Portland, Maine, students from five elementary schools conducted observations in their own schoolyards as part of environmental literacy and science education programs. Beyond New England, learners from Machias, Maine to British Columbia, and many locations in between, contributed observations, creating a geographically diverse dataset that reflects regional and continental patterns of seasonal change.

As they collected data, students also began asking their own research questions—mirroring the inquiry process used by scientists. Their questions explored differences in species behavior, the influence of sunlight, drought, wildfire smoke, and the built environment, and how these factors might affect the timing and progression of leaf color change.

Educators reported that participation in GLOBE Green Down helped students develop a stronger connection to their local ecosystems while gaining experience working with real-world scientific data. Many noted that learners were able to use their observations to discuss environmental change at both local and global scales, including potential climate change impacts on seasonal patterns.

This field season was hosted through NASA’s Science Activation program as part of the Learning Ecosystems Northeast (https://science.nasa.gov/sciact-team/gmri/) (LENE) project. LENE brings together educator learning communities across Maine, New Hampshire, Vermont, New York, and Massachusetts, fostering collaboration between school-based and out-of-school educators. Through this network, educators support STEM learning, data literacy, and local ecosystem stewardship—empowering young people to contribute meaningfully to NASA-supported scientific research.

Get Involved with GLOBE

• Educators, students, and community members interested in doing NASA science can get involved. The GLOBE Observer app offers hands-on opportunities to collect and share environmental data used by scientists around the world, while building science skills and local environmental awareness. Learn more: https://science.nasa.gov/citizen-science-old/globe-observer/

• LENE is supported by NASA under cooperative agreement award number NNX16AB94A and is part of NASA’s Science Activation Portfolio. Learn more about how Science Activation connects NASA science experts, real content, and experiences with community leaders to do science in ways that activate minds and promote deeper understanding of our world and beyond: https://science.nasa.gov/learn/about-science-activation/

Read this press release in English here.

La temperatura global de la superficie terrestre en 2025 fue un poco más cálida que en 2023 pero, dentro de los márgenes de error, ambos años está prácticamente empatados, según un análisis realizado por científicos de la NASA. Desde que comenzaron los registros en 1880, 2024 sigue siendo el año más caluroso.

Las temperaturas globales en 2025 fueron más frías que en 2024, con temperaturas promedio de 1,19° Celsius (2,14° Fahrenheit) por encima del promedio para el período de 1951 a 1980.

El análisis del Instituto Goddard de Estudios Espaciales de la NASA incluye datos de la temperatura del aire obtenidos por más de 25.000 estaciones meteorológicas en todo el mundo, así como por instrumentos a bordo de barcos y boyas que miden la temperatura de la superficie del mar, y estaciones de investigación en la Antártida. Los datos son analizados utilizando métodos que toman en cuenta la distribución cambiante de las estaciones de medición de temperatura y los efectos del calentamiento urbano que podrían sesgar los cálculos.

Además, análisis independientes realizados por la Administración Nacional Oceánica y Atmosférica (NOAA, por sus siglas en inglés), la plataforma Berkeley Earth, el Centro Hadley (que forma parte del servicio meteorológico nacional del Reino Unido) y los Servicios Climáticos Copernicus de Europa han concluido que la temperatura global de la superficie para 2025 ha sido la tercera más calurosa que se haya registrado. Estos científicos utilizan gran parte de los mismos datos de temperatura en sus análisis, pero emplean diferentes metodologías y modelos; todos ellos muestran la misma tendencia al calentamiento continuo.

El conjunto completo de datos de la NASA sobre las temperaturas de la superficie global, así como los detalles de cómo los científicos de la NASA llevaron a cabo el análisis, están disponibles públicamente en línea (en inglés).

Para obtener más información sobre los programas de ciencias de la Tierra de la NASA, visita el sitio web:

https://ciencia.nasa.gov/tierra

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Liz Vlock / María José Viñas
Sede central, Washington
202-358-1600
elizabeth.a.vlock@nasa.gov / maria-jose.vinasgarcia@nasa.gov

Peter Jacobs
Centro de Vuelo Espacial Goddard, Greenbelt, MD
301-286-0535
peter.jacobs@nasa.gov

Lee este comunicado de prensa en español aquí.

Earth’s global surface temperature in 2025 was slightly warmer than 2023 – but within the margin of error the two years are effectively tied according to an analysis by NASA scientists. Since record-keeping began in 1880, the hottest year on record remains 2024. 

Global temperatures in 2025 were cooler than 2024, with average temperatures of 2.14 degrees Fahrenheit (1.19 degrees Celsius) above the 1951 to 1980 average.

The analysis from NASA’s Goddard Institute for Space Studies includes air temperature data acquired by more than 25,000 meteorological stations around the world, from ship- and buoy-based instruments measuring sea surface temperature, and Antarctic research stations. The data are analyzed using methods that account for the changing distribution of temperature stations and for urban heating effects that could skew the calculations.

Additionally, independent analyses by the National Oceanic and Atmospheric Administration, Berkeley Earth, the Hadley Centre (part of the United Kingdom’s weather forecasting Met Office), and Copernicus Climate Services in Europe have concluded the global surface temperature for 2025 was the third warmest on record. These scientists use much of the same temperature data in their analyses but employ different methodologies and models, which exhibit the same ongoing warming trend.

NASA’s full dataset of global surface temperatures, as well as details of how agency scientists conducted the analysis are available online.

For more information about NASA’s Earth science programs, visit:

https://science.nasa.gov/earth

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Liz Vlock
Headquarters, Washington
202-358-1600
elizabeth.a.vlock@nasa.gov

Peter Jacobs
Goddard Space Flight Center, Greenbelt, Md.
301-286-3308
peter.jacobs@nasa.gov

NASA is getting ready to send four astronauts around the Moon with Artemis II, laying the foundation for sustainable missions to the lunar surface and paving the way for human exploration on Mars. As the agency considers deep space endeavors that could last months or years, it must develop ways to feed astronauts beyond sending supplies from Earth.

That is why NASA is launching the Deep Space Food Challenge: Mars to Table, a new global competition inviting chefs, innovators, culinary experts, higher-education students, and citizen scientists to design a complete, Earth-independent food system for long-duration space missions.

“In the future, exploration missions will grow in both duration and distance from Earth. This will make the critical question of feeding our astronauts more complex, requiring innovative solutions to allow for long-term human exploration of space,” said Greg Stover, acting associate administrator of NASA’s Space Technology Missions Directorate at NASA Headquarters in Washington. “Opening the door to ideas from beyond the agency strengthens NASA’s ability to operate farther from Earth with greater independence.”

Mars to Table builds on NASA’s first Deep Space Food Challenge by seeking to integrate multiple food production and preparation methods into a holistic, self-sustaining system designed for use on Mars. This new challenge is open now until July 31 to the global public and carries a prize purse of up to $750,000.

“Future crews on the Moon and Mars will need food systems that are nutritious, sustainable, and fully independent from Earth,” said Jarah Meador, program executive for NASA’s Prizes, Challenges, and Crowdsourcing Program at NASA Headquarters. “Food will play a pivotal role in the overall health and happiness of future deep space explorers. The Mars to Table Challenge is about bringing all those pieces together into one comprehensive design.”

Solvers are tasked with creating a complete meal plan suitable for astronauts living on Mars, using a NASA-created mission scenario as their guide. Each team will design a full food system concept, including a detailed operations plan and system design layout that supports a surface mission. Teams must consider every detail – from nutritional balance and taste to safety, usability, and integration with NASA’s Environmental Control and Life Support Systems.

Participants in the Mars to Table Challenge are also encouraged to address food security on Earth. Innovative growth systems designed for space could make fresh food production possible in harsh, remote, or resource-limited areas, such as research stations located at Earth’s poles or in rural areas with limited access to traditional supply chains.

“This challenge isn’t just about feeding astronauts; it’s about feeding people anywhere,” said Jennifer Edmunson, acting program manager for NASA’s Centennial Challenges at NASA’s Marshall Spaceflight Center in Huntsville, Alabama. “Novel meals that are compact, shelf-stable, and nutrient-rich could expand culinary options for groups like military personnel or disaster relief responders. By solving for Mars and future planetary expeditions, we can also find solutions for Earth.”

NASA’s Centennial Challenges have a 20-year legacy of engaging the public to solve complex problems that benefit NASA’s broader initiatives. Past challenges have spurred advances in robotics, additive manufacturing, power and energy, textiles, chemistry, and biology.

Mars to Table is a collaborative, cross-program Centennial Challenge with support from NASA’s Division of Biological and Physical Sciences, Heliophysics Division, Planetary Science Program, Human Research Program, and Mars Campaign Office. Subject matter experts at the agency’s Johnson Space Center in Houston and Kennedy Space Center in Florida support the challenge. This challenge is part of the Prizes, Challenges and Crowdsourcing program within NASA’s Space Technology Mission Directorate. NASA has partnered with the Methuselah Foundation and contracted Floor23 Digital to support the administration and management of this challenge. 

To learn more about the challenge, including timelines, submission requirements, and future webinar dates, visit:

https://www.deepspacefood.org/marstotable

By Savannah Bullard

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