Dry winter leaves farmers along Colorado River facing greater water shortages

This past winter was an extraordinarily dry one in the western U.S.

A lack of snowpack that normally feeds the Colorado River has only deepened the impact of a drought affecting tens of millions in seven states and Mexico.

Accelerated by climate change, the drought is taking a bite out of farmers' plans in Colorado.

Science correspondent Miles O'Brien reports for our series, Tipping Point. ...