Mosquito Disease Danger Days

The number of days each year that are suitable for disease transmission by mosquitoes is rising in much of the U.S., as temperatures climb with climate change. This can increase the risk of mosquito-borne diseases such as Zika and West Nile. Following research from Stanford University, Climate Central analyzed the number of days in the spring,

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Longer Heat Streaks

The summer doldrums have set in for much of the U.S., but an end to the Dog Days of summer is within sight. The Dog Days traditionally extend from July 3 to August 11, when Sirius (aka the Dog Star) rises and sets with the sun. Ancient cultures believed that additional energy from Sirius helped make the summer days hotter, but in modern times, the

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2018 Global Heat So Far

Globally, the past four years have been the hottest four years on record, and 2018 so far is coming in as the 4th hottest. All-time record heat has peppered the Northern Hemisphere this summer. Here a few stats compiled by Weather Underground: Glasgow, Scotland had its hottest day on record, reaching 89°F on June 28. Montreal, Canada set a new

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Extremely Hot Days on the Rise

Late July is the hottest time of year for much of the country. In the midst of this summer heat, we calculated the number of extremely hot days each year in 244 cities across the country and found that 73 percent experience more extremely hot days than they did a half-century ago.

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2018 U.S. Temps: State Rankings Through June

Despite a cold April, 2018 is the 14th warmest year on record so far in the U.S. Halfway through the year, Arizona and New Mexico are record hot, and the remaining southwestern states are each having one of their 10 hottest years. In fact, the four hottest years in the U.S. have all come in the decade of the 2010s. July has been a scorcher from

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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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