A new generation of inexpensive, portable air-quality sensors is making it easier for citizen groups and individuals to monitor the air around them.
The federal Highway Trust Fund is running dry, but raising the federal 18.4-cent-per-gallon gas tax is a political nonstarter.
Scientists are publishing emotional letters about the threat of climate change, hoping to engage the public on a new website.
Updated design, safety protocols, and job training will help U.S. plants prepare. But improvements are "ongoing" and hard to quantify.
Brazil Made Big Environmental Promises for the World Cup and the Rio Olympics. Here's Why It Won't Keep Them.
Sustainability is a necessary buzzword for any mega-event, but reality often falls far short.