Slowing the rise in human numbers is essential for the planet--but it doesn't require population control
The melting Arctic is releasing vast quantities of methane. How big is this greenhouse threat? What can be done?
Lester Brown, at times ridiculed, has been warning the world for 40 years about coalescing energy, food and population crises. So why is he optimistic now?
Forward-thinking companies, universities and municipalities are finding creative ways to run on renewable power