Climate Change

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Since 1751 about 337 billion metric tons of CO2 have been released into the atmosphere from the burning of fossil fuels and cement production, [9] increasing atmospheric CO2 from the pre-industrial level of about 280 ppm (parts per million), to a high of 400 ppm in 2013. [10] Methane, which is increasing in the atmosphere due to agriculture and fossil fuel production, traps 84 times as much heat as CO2 for the first 20 years it is in the atmosphere, [11] and is responsible for about one-fifth of global warming since 1750.
— Euan G. Nisbet, Edward J. Dlugokencky, and Philippe Bousquet, "Methane on the Rise – Again," Science, Jan. 2014
CO2 produced by burning fossil fuels such as oil and coal [18] can be differentiated in the atmosphere from natural CO2 due to its specific isotopic ratio. [101] According to the Intergovernmental Panel on Climate Change (IPCC), 20th century measurements of CO2 isotope ratios in the atmosphere confirm that rising CO2 levels are the result of human activity, not natural processes such as ocean outgassing, volcanic activity, or release from other “carbon sinks.”
— Intergovernmental Panel on Climate Change (IPCC), "Climate Change 2007"
 
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O2 is already saturated in earth’s atmosphere, and more CO2, manmade or natural, will have little impact on climate. As CO2 levels in the atmosphere rise, the amount of additional warming caused by the increased concentration becomes less and less pronounced. Additional increments of CO2 will cause relatively less direct warming because we already have so much CO2 in the atmosphere that it has blocked most of the infrared radiation that it can.
— Senate testimony by William Happer, PhD, Professor of Physics at Princeton University
The fact is that even if every American citizen biked to work, carpooled to school, used only solar panels to power their homes, if we each planted a dozen trees, if we somehow eliminated all of our domestic greenhouse gas emissions, guess what — that still wouldn’t be enough to offset the carbon pollution coming from the rest of the world.
— Secretary of State John Kerry, December 2015