Environment

Journalist Beth Gardiner and activist Yvette Arellano explain the long-term health effects of air pollution. Yvette lives in a Houston neighborhood near the largest petrochemical complex in the U.S.

Dinosaurs ruled Earth for 180 million years, but to dominate they had to outcompete a slew of other animals. Paleontologist Emma Schachner thinks their lungs could have been the competitive advantage

There are reports that ex-Michigan Gov. Snyder and others will be charged in relation to the crisis that began seven years ago. There is also word that a possible civil settlement in the works.

The Trump administration is trying to force banks to make loans to gun-makers and to finance payday lenders. Critics call the move bizarre. It's opposed by watchdog groups and banks.

Lopez, who died Dec. 25, won the 1986 National Book Award for Arctic Dreams, an account of his travels in the far north over a period of four years. Originally broadcast in 1989 and 2013.