Driving into lower Manhattan is now more expensive, but the toll promises cleaner air, safer streets, and improved subways.

If the U.S. adopted a national flexitarian diet, researchers say it would reduce the footprint of farmland across the country by roughly the size of South Dakota — freeing that land for efforts that improve carbon sequestration and biodiversity.

Public funding helped electric vehicles go mainstream. Are alternative proteins next — or are they too polarizing?