For the people who eke out an existence in Africa's semiarid Sahel region south of the Sahara, a shift in climate is nothing short of disastrous. What makes the Sahel so unstable, and why is it shifting?
The idea behind a green transportation infrastructure is one that provides opportunities for people to get around their communities using their own power -- such as walking or biking. In this article we 10 ideas for greener transportation. See more »
Agronomists, environmentalists, and economists around the globe have been debating how to feed everyone on it for years and years. See more »