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Includes natural changes (cyclic variability, volcanic eruptions, solar output) and human-caused changes (due to GHG emissions and land use changes)

Global warming is one symptom of the much larger problem of human-caused climate change.

Concentration of carbon dioxide is about 1.4 times what it was before the Industrial Revolution. How much and how fast will Earth warm if carbon dioxide concentrations double the pre-industrial?

How do we know we can trust the historical surface temperature record? Did global warming stop in 1998? What actions can businesses or individuals take to reduce climate chagne from greenhouse gas emissions? Get asnwers to these and other frequently asked questions.

The most likely explanation for the lack of significant warming at the Earth’s surface in the past decade or so is that natural climate cycles caused shifts in ocean circulation patterns that moved some excess heat into the deep ocean.

NASA "Ask US" Educator Professional Development Hangout
January 15, 2015

Although 97% of active climate scientists agree that the earth is warming due to human activities, some polls have found that only 44% of American share this view. As an educator, you are likely to encounter people who have received information that conflicts with the accepted climate science, perhaps from sources that they trust. This session will help you better understand American's perceptions of climate change and provide tips for better communicating climate science.

Researchers Offer New Insights Into Predicting Future Droughts in California

According to a new NOAA-sponsored study, natural oceanic and atmospheric patterns are the primary drivers behind California's ongoing drought.

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