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Airs Tuesday, March 16, 2010 at 8 p.m. on KPBS TV

Every spring and summer, after the winter thaw allows, about a dozen Navajo families still return to their old homesteads at the bottom of Arizona's Canyon de Chelly. The canyon has cradled human civilization for thousands of years.

San Diego may be facing some tight water supplies in the near future. Officials have already asked us to voluntarily conserve because of dry conditions. But potential cutbacks to one of San Diego's ke

The government of Kiribati, a set of islands in the Pacific Ocean, is worried that climate change and population pressure could make significant parts of the country uninhabitable within the century. With help from abroad, it has begun the slow process of familiarizing residents with nearby Australia.

Corn and soybean prices jumped as much as 30 percent this fall from last year, prompting farmers to sell their crops before they're even harvested. But high grain prices also mean consumers will be looking at pricier Thanksgiving turkeys in the grocery aisle.

Wildfires rage in the Western states, aided by a drought caused by last week's heat wave. One wildfire raced out of a canyon in South Dakota's Black Hills, destroying 27 houses and killing a homeowner who tried to go back to save some belongings.

Remembering the Fires...

A new report from an environmental group says California businesses have the tools to save enough water to meet the annual needs of San Diego, Los Angeles and San Francisco.

Until just a few months ago, farmers in Argentina were thriving like never before. Now, they are facing the pressures of a worsening international economy, as well as drought. Demand for crops is plummeting as costs for fertilizers, herbicides and other necessities have gone up.

Military officials spoke at a California senate hearing in San Diego on Friday to discuss how climate change could lead to political instability around the world.