Tipping Points: Environmental Trends to Destroy or Save Civilization

With civilization standing at multiple self-generated tipping points, a renowned environmentalist outlines 10 environmental trends of grave concern and 10 trends that give us reason for hope.

environmental trends - world hunger
Spreading hunger, a consequence of environmental stress, is one of 10 troubling environmental trends humanity faces. The government of Bangladesh had to subsidize rice in 2008 when the cost of food skyrocketed.
PHOTO: PAVEL RAHMAN/ASSOCIATED PRESS