Los Angeles and other U.S. cities are covering their asphalt roads with a coating that prevents the blacktop from absorbing and radiating the sun's heat.
U.S. tree lovers observe Arbor Day in April, as a private foundation plants more than 5 million trees in 2015 to help clean the air and beautify the Earth.
Here are shareable photos of President Trump at the 72nd United Nations General Assembly, where he committed to the U.N.'s original pillars of peace.
President Trump declared North Korea a state sponsor of terrorism on November 20. The U.S. will levy the largest sanctions ever against North Korea.
Four U.S. research centers are developing technologies that can turn certain plants — such as switchgrass, poplar or sorghum — into biofuels.
When you think about how to build a better world, think about providing clean water to about 663 million people worldwide who don’t have it.
Greenhouse gases are altering ocean chemistry. The acidification is damaging marine creatures and their ability to avoid predators and find food and mates.
U.S. police officers are working on curbing hate crimes in their communities and around the world by sharing their experiences with other local forces.
The U.S. Navy's goal is to get 50 percent of all the fuel it needs for its ships, jets and shore installations from alternative, renewable sources by 2020.