The population of one of the most common hummingbird species in the U.S. is plummeting. Climate change may be the culprit.
Since 1979, Robert Bullard has studied the disproportionate impacts of pollution on communities of color. He reflects on the past and future of the environmental justice movement.
From the first Earth Day in 1970 to today’s youth climate strikes, researchers and activists look back at the decades-long fight for a healthy planet.