Susan Phillips

"Steam loops" under hundreds of U.S. cities and universities have warmed buildings for a century. Now they could become a climate change solution.

Fifteen states are challenging the decision, arguing that the risk of explosion puts lives in danger. For one project, highly flammable gas will travel 200 miles through a busy East Coast corridor.

Chemical experts say recent refinery explosions could have been far more devastating if deadly hydrogen fluoride was released. Some are calling for a ban on the chemical.

Japan doesn't think battery electric cars are the only future for transportation. It is investing millions to ramp up production of hydrogen fuel cell vehicles, citing their convenience for consumers.

The chemicals, which are linked to health problems, have contaminated drinking water and soil in many parts of the United States. Critics say the EPA is not acting fast enough to limit them.

Many major airports are on low-lying coastal land where flooding is getting worse. They're building walls, berms and other barriers to try to keep planes and people moving.

Close to 800,000 records from about a dozen plant collections or "herbaria" are being digitized, allowing researchers broad access to data on plant species collected and preserved in past centuries.