Don't blame climate change for the 39,000 forest fires now incinerating huge tracts of the Brazilian Amazon. This environmental catastrophe is human-made and highly political.
Bison once dominated the Great Plains but were nearly wiped out by hunters in the 1800s. Now scientists are learning that bison's presence improves plant and wildlife diversity on the prairies.
Brazil has been throwing money at Amazonian cattle farmers, hoping they'll adopt 'greener' crops like fruit or corn. A new study shows why loans won't fix the environmental issue presented by ranches.