‘One in 14 trees is dead in Colorado forests and the number of gray-brown standing-dead trees has increased 30 percent since 2010 to 834 million, the state’s annual survey has found.”
http://www.denverpost.com/2017/02/15/dead-trees-colorado-forests/

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CO2 Levels, Mauna Loa, HI 406 ppm
https://scripps.ucsd.edu/programs/keelingcurve/