This week, NOW travels to the nation of Kiribati to see up close how global warming is affecting residents’ daily lives and how they are dealing with the reality that both their land and culture could disappear from the Earth. Watch. (Originally aired: 12/12/2008).

Denis Belliveau and Francis O’Donnell took a wild idea – retrace Marco Polo’s entire 25,000-mile, land-and-sea route from Venice to China and back – and spent two incredible years of their lives filming the trip. Watch full documentary.

Yellowstone…Yosemite…the Grand Canyon…remember those family trips to our National Parks? Maybe you packed up the family in the station wagon and drove for days - fighting with your brother and …

After a decades-long comeback, the grizzly bears of Yellowstone appear to be thriving. Should they now be removed from the protection of the Endangered Species Act? Discover the complex issue of grizzly bear management and conservation from ranchers, conservationists, and government officials who share their stories and insights. Watch now.

As one of the most progressive voices in the Senate who also campaigned for President-elect Obama, what does Russ Feingold (D-WI) expect of the next four years? Watch. (Originally aired: 12/5/2008).