New LED streetlight design curbs light pollution

Streetlights illuminate the night, shining upon roadways and sidewalks across the world, but these ubiquitous elements of the urban environment are notoriously inefficient and major contributors to light pollution that washes ...

Clamorous city blackbirds

(Phys.org)—Animals have developed a variety of strategies for dealing with increasing noise pollution in their habitats. It is known, for example, that many urban birds sing at a high pitch to differentiate their song from ...

New mileage standards would double fuel efficiency

The Obama administration has finalized regulations that will force automakers to nearly double the average gas mileage of all new cars and trucks they sell in America by 2025.

Defectors take the car, cooperators go by bus

National economies are driven by the automobile, even during an economic downturn. Every day, hundreds of millions of people take their cars to visit remote places, to commute, and to reach the supermarket.

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