21:5721:57, 3 August 2012diffhist+272
Ozone depletion
water-ice clouds<ref>[http://www.sciencenews.org/view/generic/id/342528/title/Stronger_storms_may_destroy_ozone ''Stronger storms may destroy ozone; Extra water vapor up high coul trigger destructive chemical reactions''] by Devin Powell Web edition
21:1021:10, 3 August 2012diffhist+208
Bromus tectorum
http://www.nytimes.com/2012/07/31/science/earth/a-fungus-emerges-as-weapon-against-cheatgrass.html ''Out West, ‘Black Fingers of Death’ Offer Hope Against an Invader''] July 30, 2012 New York Times