In southwest Australia years of drought, believed to be linked to climate change, have had a huge impact on rice production.

CNN: Feeding the future: Saving agricultural biodiversity

According to research published in the journal Science, the Anasazi -- the ancestors of modern Pueblo Indians, who built elaborate stone and adobe structures in the American Southwest -- also may have succumbed to decades of intense drought and cooler temperatures during the 13th century, in addition to factors like warfare and religious turmoil.

CNN: Past may hold clues to climate's future

And the there are periods in between when you're apt to have drought, and that's especially problem in the Southwest where Lake Powell, you know, went down about 100 feet and has recovered a little bit.

NPR: Can Climate Change Explain Odd Weather?