Sunday, January 11, 2015
Climate change: how do we know?
A
piece
from NASA, giving the arguments why global warming is real.
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![This graph, based on the comparison of atmospheric samples contained in ice cores and more recent direct measurements, provides evidence that atmospheric CO<sub>2</sub> has increased since the Industrial Revolution. (Source: [[LINK||http://www.ncdc.noaa.gov/paleo/icecore/||NOAA]])](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_schMlUrCmEhKqt5PrjUcx5jVAtTYTN6lXVsPJFftnEGh7AGfxqo8xW59h8a2tuIYETSrKdT5aQHcezpYDQbZNTvtGtDxmv8b-HhOmCUftDOgbjY9veYGUkE38AxnMeo4B9ATzdBbIg31WPHuCztqKto_oZVWpG=s0-d)
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