As the level of carbon dioxide in the air rises because of human activity, scientists are trying to pin down how plants are affected. There's evidence that it's changing many important plants we eat.
A study by the Union of Concerned Scientists examined how real estate values were affected in 23 coastal states. Florida has the most to lose, according to the research.
Forest officials closed the San Juan National Forest in southwest Colorado because of "historic levels" of fire danger. The closure will affect local tourism economies.
The EPA intends to block rules to prevent and respond to leaks, explosions and other disasters at chemical facilities and refineries around the U.S. That scares many people who live and work nearby.