Smoky haze from wildfires in Canada obscures New York City's Empire State Building this year. The air in the U.S. has improved over the past 50 years, but smoke pollution from growing wildfires erodes much of that progress. David Dee Delgado/Getty Images hide caption
President Biden promised to create the Climate Corps during his first week in office. It's a program meant to appeal to young climate activists. Jim Watson/AFP via Getty Images hide caption
The roundhouse under construction at Wahhoga Village in Yosemite National Park. Southern Sierra Miwuk Nation hide caption
Thousands of activists, indigenous groups, students and others take to the streets of New York for the March to End Fossil Fuels protest on Sunday, Sept. 17, in New York. Spencer Platt/Getty Images hide caption
People rally to end fossil fuels in New York Sunday ahead of the 78th United Nations General Assembly and Climate Ambition Summit. Leonardo Munoz/AFP via Getty Images hide caption
A motorist travels through floodwaters on a road that remains closed a day after Atlantic storm Lee passed through the region, on Sunday, Sept. 17, 2023, near Northeast Harbor, Maine. Robert F. Bukaty/AP hide caption
Climate activists participate in a rally outside of the Museum of Modern Art on Friday, Sept. 15, 2023, in New York. Climate activists with Extinction Rebellion NYC organized a rally outside MoMA ahead of this weekend's "March to End Fossil Fuels," calling on the museum to end its partnership with KKR, a private equity firm that has invested nearly $15 billion in fossil fuel projects. Michael M. Santiago/Getty Images hide caption
Pesky Pete Barron holds the leaves of poison ivy illustrating how it grows in clusters of three leaves. Jesse Costa/WBUR hide caption
In this aerial picture taken on Aug. 21, a vehicle drives through floodwaters following heavy rains from Tropical Storm Hilary in Thousand Palms, Calif. Josh Edelson/AFP via Getty Images hide caption
Search and rescue operations are underway in the region affected by floods due to Storm Daniel in Derna, Libya, Sept. 14. Hamza Al Ahmar/Anadolu Agency via Getty Images hide caption
Rich Snyder, who retired as the fire marshal of Sierra Madre, Calif., now works for Allied Disaster Defense, a California company that hardens homes against wildfire. One strategy is covering air vents with ember-blocking mesh. Liz Baker/NPR hide caption
A couple walks in a flooded Saint Mark's Square during high waters on Nov. 19, 2013, in Venice, Italy. Marco Secchi/Getty Images hide caption
Internal Exxon documents obtained by The Wall Street Journal span Rex Tillerson's tenure as the company's chief executive from 2006 until 2016. Brian Harkin/Getty Images hide caption
A volunteer takes a break on the rubble of a building in a flash flood-damaged area in Derna on September 14, 2023. The Libyan Red Crescent said Thursday that more than 11,000 were killed in the flood and another 10,000 were still missing. Abdullah Doma/AFP via Getty Images hide caption
The city of Derna, Libya on Wednesday, Sept. 13, 2023. Floods from extreme rain killed thousands of people and washed entire neighborhoods into the sea. Muhammad J. Elalwany/AP hide caption
Threatened by rising sea levels, San Francisco is considering drastic measures to save its historic shoreline. Above, the Ferry Building pictured in 2009. Anthony Jacobs/AP Images for T-Mobile hide caption
A combination image of satellite photos shows an area before and after a powerful storm and floods hit the country, in Derna, Libya, on Sept. 2 (top) and Sept. 12. EyePress News/EYEPRESS via Reuters Connect hide caption
The flooded St. Mark's Square on Nov. 15, 2019, in Venice, two days after the city suffered a high tide. Filippo Monteforte/AFP via Getty Images hide caption
People check an area damaged by flash floods in Derna, eastern Libya, on Monday. AFP via Getty Images hide caption
Hurricane Lee is expected to restrengthen in the coming days, the National Hurricane Center said Sunday. National Oceanic and Atmospheric Association/Screenshot by NPR hide caption
Clouds surround downtown Phoenix at sunset on July 30, 2023. Matt York/AP hide caption
Emissions from burning fossil fuels aren't falling fast enough to stop dangerous levels of warming, a U.N. report warns. Christopher Furlong/Getty Images hide caption
According to he U.S. Fish and Wildlife service, about 99% of the species that have gotten protection from the landmark law – like the Key Deer — have avoided extinction. Ryan Kellman/NPR hide caption