Highlights

Since 1989, the U.S. Global Change Research Program (USGCRP) has submitted annual reports to Congress called Our Changing Planet. The reports describe the status of USGCRP research activities, provide progress updates, and document recent accomplishments.

In particular, Our Changing Planet highlights progress and accomplishments in interagency activities. These highlights represent the broad spectrum of USGCRP activities that extend from Earth system observations, modeling, and fundamental research through synthesis and assessment, decision support, education, and public engagement. Highlights describe the state of science at the time of publication of each yearly report, and may not reflect more recent advances in understanding. The date of publication of the source report is noted on each highlight page.

The American Samoa Observatory situated against a backdrop of green mountains and cloudy blue skies.

Interagency observations and analyses show that emissions of the second-most important ozone-depleting substance are back on the decline after a recent surge.

Atmospheric measurements show that concentrations of ozone-depleting gases are declining in response to global controls on their production and use enacted under the Montreal Protocol of 1987 and its amendments. The decline since the early 1990s in the atmospheric concentration of trichlorofluoromethane (CFC-11), once widely used as a foaming agent and refrigerant, has been an important component of ozone layer...

Phytoplankton blooms appear as swirls of color in the Bering Sea, captured in moderate resolution satellite imagery.

Scientists are investigating the movement of carbon from the atmosphere to the deeper ocean via ecological processes.

Microscopic organisms known as phytoplankton in the upper ocean play a critical role in Earth’s carbon cycle and climate, transporting carbon from the surface to the deeper ocean where it is stored for months to millennia. This movement of carbon—known as the biological carbon pump— represents a significant sink for atmospheric carbon dioxide, but measuring it remains a challenge. A better understanding of what influences the function of the ocean's...

A map showing below average background methane levels in the Northeast, Southeast, and Northwest United States; close to normal levels in the Great Plains, Midwest, and partial Southwest regions; and above average levels in the San Juan Basin.

A coordinated observing campaign uncovered the causes of an unexpected methane plume spotted by satellite.

Methane is a potent greenhouse gas emitted by both...

An aerial view of the Polarstern during the day, drifting with Arctic sea ice.

The Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) project concluded a yearlong expedition into the Arctic ice pack, collecting data that aims to advance understanding, modeling, and prediction of Arctic environmental change.

Sea ice cover in the Arctic Ocean has shrunk dramatically over the past four decades as temperatures in the region have warmed at over twice the rate as the rest of the globe. This trend is expected to continue, resulting in nearly sea-ice free late...

The U.S. research centers that develop climate and Earth system models and the U.S. scientific community are key participants in long-running collaborative efforts to improve knowledge on climate change. A number of major interagency activities supporting improvements in climate modeling took place in 2019.

Most prominently, the World Climate Research Programme Coupled Model Intercomparison Project (CMIP) is currently in its sixth phase (CMIP6). The earlier phases of CMIP experiments have provided the research community...

A plume of wildfire smoke extends over a dry landscape, partially obscuring a view of the Columbia River. Farmlands appear in the lower left corner of the image, with higher elevation terrain at the top of the image.

Fire risks to human health and property have increased in recent decades due to the impacts of a warmer, drier climate on ecosystems as well as historic land use and management practices. Smoke from wildfires in the western United States and agricultural fires in crop-producing regions such as the southeastern United States increasingly impacts air quality, with expected negative effects on human health.^{^[1]}

The impacts of smoke on atmospheric conditions depend on...

A bright green algal bloom covers most of the lake surface. Roads, fields, and other settlements are visible along the lake’s edge.

Harmful algal blooms, or HABs, occur when colonies of cyanobacteria grow to a much greater size and density than normal, resulting in negative effects on water quality, ecosystem health, and the health of humans and animals. Climate-related factors contribute to HABs, including water temperatures and the frequency and intensity of extreme events such as intense storms, both of which are affected by climate change. The impacts of climate change are expected to further increase risks from HABs in recreational and drinking water sources in the coming decades....

Three successive images showing vegetation growth over time on agricultural lands between the Mississippi and Missouri rivers.

USDA’s National Agricultural Statistics Service (NASS) and Economic Research Service (ERS) track U.S. crop production each year, relying in large part on producer surveys and ground observations to estimate acreage and yields at state and county levels. During the growing season, production data inform estimates of crop acreage and yields that help farmers and traders set prices. Satellite data offer a useful method for validating statistics collected on the ground, and can help fill in gaps in ground observations, particularly in years where planting is delayed or disrupted due to weather...

A bar chart showing an increase in weather and climate disasters causing more than one billion U.S. dollars in direct losses from 1980 to 2020. Event types shown are drought, flooding, freeze, severe storm, tropical cyclone, wildfire, and winter storm.

Climate indicators show trends over time in key aspects of our environment, such as greenhouse gas levels in the atmosphere, temperatures across land and sea, and the extent of Arctic sea ice, as well as metrics of social or economic exposure to the impacts of climate variability and change. Indicators are based on long-term, consistently collected data and can be used to assess risks and vulnerabilities from a changing climate and to inform response actions. USGCRP’s Indicators Interagency Working Group (IndIWG) leverages existing agency research, data, and indicators in support of...

USGCRP’s International Activities Interagency Working Group (IAIWG) convened its first international and interagency workshop in December 2018, bringing together representatives from System for Analysis, Research and Training (START), Future Earth, and the World Climate Research Programme (WCRP). These three international programs receive funding through USGCRP to support their activities and to advance USGCRP’s international mandate. USGCRP was represented by ten Federal agencies as well as USGCRP staff. The workshop’s goals were to enhance awareness of mutual priorities, investments, and...

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Highlights

Supporting ozone layer recovery

Measuring the strength of the ocean’s biological carbon pump

Investigating methane emissions in the San Juan Basin

Understanding rapid change in the Arctic

Modeling efforts drive advances in projections of future climate change

An observing campaign investigates the impact of fires on air quality and climate

Research and decision tools support management of harmful algal blooms

Satellite and ground data track status of the nation’s food supply

An interagency platform highlights important indicators of change

USGCRP enhances cooperation among international global change science organizations