Climate Change 15 hours ago Breaking down the greenhouse effect Greenhouse gas emissions have raised the temperature on Earth, and emissions by humans are amplifying that effect. Meteorologist Vianey Arana reports. US & World Videos 1:59 Climate tech conference gets underway in Silicon Valley 3:20 What's in store for the Bay Area this winter 3:09 Push to roll out safer, electric school buses 3:13 Climate change's impact on fall foliage 1:56 49ers doing their part to reduce emissions at Levi's Stadium
