Science of Climate Change in 24 Steps
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What the Science SaysSource
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1~70% of solar energy that hits Earth is absorbed and re-emitted, some of it trapped by greenhouse gaseshttp://bit.ly/1yIavdm
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2Without greenhouse effect, Earth would be ~33˚C colderhttp://1.usa.gov/1wThhh2
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3CO2 levels have increased 40% since Industrial Revolutionhttp://bit.ly/1Btxdbp
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4Solar activity and temperature show opposite trends in recent decadeshttp://bit.ly/1zFZ7wNhttp://bit.ly/1CZTAXv
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5The lower atmosphere is warming while the upper atmosphere is coolinghttp://bit.ly/1uaOQ87http://bit.ly/1vFlJOF
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6Humans have added 2,000 gigatons of CO2 to atmosphere since 1870, and 40% has stayed therehttp://bit.ly/160bj2rhttp://bit.ly/1vwNQKU
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7CO2 levels havent been this high (>400 ppm) since before humans existedhttp://bit.ly/1AUVofI
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8Earth is warming ~10X faster than at end of an Ice Agehttp://1.usa.gov/1CZVDLj
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9Carbon isotopes tell us that increased CO2 is coming from burning fossil fuelshttp://1.usa.gov/1z07Bzl
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10Volcanoes are not the source of modern climate changehttp://on.doi.gov/12F8eme
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11Carbon sinks and carbon sources are out of balancehttp://bit.ly/1uaZ0FR
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12Methane and nitrous oxide are increasing (also due to human activities)http://1.usa.gov/1uaZ74n
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13Climate models are unable to replicate warming trend unless man-made CO2 is taken into accounthttp://bit.ly/1IqPUyl
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14There were twice as many record highs as record lows in 2000's and past three decades were warmest since 1850http://1.usa.gov/1wqORLIhttp://1.usa.gov/1A8P3MR
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15Average global temperatures have increased about 1˚C since 1900, and most since 1970http://1.usa.gov/12Fa3zD
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16The past 30 years is likely the warmest in eight centurieshttp://www.ipcc.ch/report/ar5/
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17Oceans abosrb 90% of Earth's heathttp://bit.ly/1ywrICK
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18Sea levels have risen ~8 inches since 1901, and are rising 0.1 inches per yearhttp://bit.ly/1yIqkAK
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19Sea levels rise due to thermal expansion of waterhttp://bit.ly/1ytK4ZX
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Melting ice on land contributes to sea level rise (not melting sea ice)
http://bit.ly/1ytKgIx
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21CO2 dissolving in ocean drives ocean acidifcationhttp://amzn.to/1w6itfl
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22Oceans could hit pH 7.8 in 100 yearshttp://bit.ly/160j3BJhttp://amzn.to/1w6itfl
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23Summer sea ice levels have decreased 40% since 1978http://1.usa.gov/1A8RDT4
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24Melting sea ice increases heat absorbed by oceans, which causes a feed-forward cyclehttp://bit.ly/1wTFXFZhttp://1.usa.gov/1BtSotS
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