The tech giant, which says it has been "carbon neutral" for years, is vowing to go "carbon negative" — by cutting emissions, planting trees and investing in new carbon removal technology.
In the search for alternatives to coal and gas, some European countries have turned to a very old fuel. They're importing wood from the United States. Some environmentalists say it makes no sense.
Carbon emissions from global air travel are rising fast, and U.S. passengers make up the largest share. But some are vowing not to fly at all, motivated by guilt and concern for the environment.
The young Swedish activist led a protest at the White House on Friday. But she wasn't looking to go inside. "I don't want to meet with people who don't accept the science," she says.
China has taken dramatic steps to fight climate change, including shutting major coal power plants. But now it plans to build hundreds of coal plants abroad.
A law — the first in the world — will require retrofits of large buildings, with a price tag in the billions. Buildings are responsible for about 70% of the city's greenhouse gas emissions.