Deke Arndt, Chief of the Climate Monitoring Branch, at the National Climatic Data Center talks about the influence of La Niña on the 2011 global average temperature. 

Despite the double-dip La Nina that occurred throughout the year, 2011 was still among the 15 warmest years on record. Including the 2011 temperature, the rate of warming since 1971 is now between 0.14° and 0.17° Celsius per decade (0.25°-0.31° Fahrenheit), and 0.71-0.77° Celsius per century (1.28°-1.39° F) since 1901.

 

It is virtually certain our world will continue to warm over this century and beyond. The exact amount of warming that will occur in the coming century depends largely on the energy choices that we make now and in the next few decades.

Claudia Mengelt and Robert Fri talk about strategies for adapting to and reducing global climate change.

Humans currently release about 70 million tons of carbon dioxide every day into the atmosphere and about 20 million tons is being absorbed regularly by the oceans, causing the pH to drop.  Chris Sabine describes current and projected future impacts of this acidification on marine ecology.

As of 2010, the warming ;effect of long-lived reenhouse gases in Earth's atmosphere has increased by more than 30% since 1990.

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