Residents in the Eckington neighborhood of Northeast DC told 7News they are worried about their safety and traffic congestion ...

New studies from Germany and Hong Kong pinpoint specific sources of light pollution keeping our cities excessively bright at ...

After passing a Dark Sky ordinance to curb light pollution and save energy, Pittsburgh is installing adjustable streetlights.

Cities are seeking low-cost ways to ease the heat island effect. Researchers found benefits and trade-offs in two popular ...