Food and water shortages fueled in the future by global warming could spur conflicts and even wars over these essential resources, the authors of a new study warn.

The term "biofuels" suggests renewable abundance: clean, green, sustainable assurance about technology and progress.

Half a century after Mao Zedong’s “Great Leap Forward” brought irrigation to the arid grasslands in this remote corner of northwest China, the government is giving up on its attempt to make a breadbasket out of what has increasingly become a stretch of scrub and sand dunes.