It's been 30 years since much of the world learned that global warming had arrived. On June 23, 1988, NASA scientist James Hansen testified before Congress, explaining that heat-trapping gases spewed by the burning of fossil fuels were pushing temperatures higher.
But it turns out climate isn't the only thing that's changing: Nature itself is, too. That's the picture painted by interviews with more than 50 scientists and an Associated Press analysis of data on plants, animals, pollen, ice, sea level and more.
You don't need a thermometer or a rain gauge to notice climate change, and you don't need to be a scientist to see it.