Greenhouse Gas Concentrations

Volume II of the Fourth National Climate Assessment (NCA4) is expected to be released soon. Written by more than 300 scientists, this report comes from the congressionally mandated U.S. Global Change Research Program (USGCRP), which was created with the passage of the Global Change Research Act of 1990. Volume I of NCA4, the Climate Science Special

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New Homes in the 2050 Coastal Flood Zone

In 2012, Hurricane Sandy slammed into New Jersey, producing a major storm surge and damaging or destroying many thousands of homes. Over the years that followed, builders put up new houses and reconstructed damaged ones, in many areas that will be vulnerable to more flooding in the future — even in the absence of a superstorm like Sandy. The post-

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The Widespread Climate Benefits of Trees

With fall foliage at its finest this month, it’s a popular time to celebrate trees. This week, we’re branching out beyond their vibrant colors to explore how trees benefit our climate and health. To quantify these benefits, we turn to the U.S. Forest Service, which has developed a series of free tools that measure the impact of trees on many scale

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Fall Nights Are Warming in Our Changing Climate

Fall is a season of transition and big swings in weather; snow has already fallen in the Front Range of the Rockies, while warm and humid conditions hung over the East Coast as recently as last week. As the climate changes, fall is not as cool as it used to be, and cooler weather is being delayed until later in the season. This change affects the

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Climate Change Increasing Frequency of Coastal Flooding

“King Tides,” the highest astronomical tides of the year, are just around the corner — as the Earth, moon, and sun line up for peak gravitational pull on the oceans. Ocean currents and topography also play a role in when these peaks occur and how high they get. On the East and Gulf Coasts, they tend to come in October, while on the West Coast, they

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Climate Indicators

Learn more about the 10 key indicators of a warming climate

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Arctic Sea Ice

Ice has both ecological and economic benefits and its extent could influence weather around the world.

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El Niño

El Niño is a warming of waters in the equatorial Pacific that influences global weather patterns.

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Ocean Acidification

Acidifying oceans can hurt coral reefs and shellfish as well as the people that rely on them for their livelihoods.

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Carbon Dioxide

CO2 is a potent greenhouse gas and plays a vital role in regulating Earth's surface temperature through radiative forcing and the greenhouse effect

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Extreme Heat

Increasing frequency and magnitude of extreme heat can affect health, power usage and more.

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Snow Cover

A shorter snow season increases the amount of sunlight absorbed by the Earth’s surface and can further warm the planet.

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Sea Level Rise

Sea level rise could force millions to leave coastal areas and cost the world trillions of dollars.

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Land Ice

Melting land ice contributes to sea level rise.

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U.S. Wildfires

Wildfires damage forests and release CO2.

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Global Temperature

The global temperature is the clearest measure of how human greenhouse gas emissions are affecting our planet.

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