After years of drought, officials declared a shortage on the Colorado River. The decision triggers mandatory restrictions on water use.
After years of drought, officials declared a shortage on the Colorado River. The decision triggers mandatory restrictions on water use.
Some devastating impacts of climate change are now unavoidable, a leading scientific panel has warned, but there’s still time to avoid the very worst.
A North Carolina community risks washing away, and solutions don’t come cheap. It very likely offers a glimpse of things to come.
Readers react to G.M.’s announcement of a phaseout of gas-powered cars and trucks by 2035. Also: Attacks on women in New York; putting science to work.
How big automakers are abandoning resistance
A reader faults the president’s priorities in the midst of a health crisis. Also: The problem with electric vehicles.
Readers respond to articles in Science Times.

Maserati celebrates its 100-year anniversary; BMW announces plans to expand hybrid-electric offerings.
A pollution plan to require hybrid and electric vehicles, while useful, won’t be enough

Two of the biggest makers of electric cars are pushing plans to lift sales: General Motors, aiming for the luxury market with the Cadillac ELR, and Nissan, with a cheaper Leaf.
The Cadillac ELR is a plug-in hybrid luxury coupe based on the Chevrolet Volt.
The midsize 6-passenger S.U.V. is designed specifically for the North American market.
The Japanese automaker cut the price of its base Leaf model by 18 percent and announced other improvement to spur consumer interest in the electric car, which is a cornerstone of Nissan's strategy.
By summer’s end, nearly a dozen plug-in cars and crossovers may be traveling California’s highways. Here is a look at some of the newest models.
If the Obama administration is serious about boosting the fuel efficiency of the American fleet, it must do more than just tighten fuel-economy standards to steer drivers to the new cars.
The Prius is the best-selling hybrid in the world because it not only has an alternative powertrain, but it has an alternative look. Most other hybrids look like any other car. Even if G.M. couldn't exactly carry over the styling of the show car, they should have made the actual design more exotic, because the people that buy them are not interested in making a subtle statement. They'll want everyone to know how green they are.