Lois Parshley

The Indian River Lagoon, a long braid of brackish mangroves and shifting islands, runs along Florida’s Atlantic coast. It is home to 4,300 species, including many of the state’s remaining manatees, whose large, paddle-tailed bodies graze slowly through the shallows. For decades, the lagoon has also been a destination for Florida’s municipal sewage. State law long ago aimed to stop much of the flow from wastewater plants, but in practice continued to allow dumping during heavy rains.

On Labor Day, you could drive from Minnesota’s border with Canada all the way to where Louisiana hits the Gulf of Mexico and not encounter a high under 90 degrees. The heat hasn’t broken: Today, nearly a third of Americans are sweltering under heat alerts.Such weather is a fitting end to a devastating season, the kind you run out of superlatives for. This summer, climate extremes suddenly seemed to be everywhere, all at once.

Ever since some of the earliest projections of climate change were made back in the 1970s, they have been remarkably accurate at predicting the rate at which global temperatures would rise. For decades, climate change has proceeded at roughly the expected pace, says David Armstrong McKay, a climate scientist at the University of Exeter, in England. Its impacts, however, are accelerating—sometimes far faster than expected.For a while, the consequences weren’t easily seen.

Photographs by Acacia JohnsonStephen Payton has spent a lot of time planning for disaster. The environmental program coordinator for the Seldovia Village Tribe in Southcentral Alaska and a board member of the Seldovia Oil Spill Response Team, he’s helped organize countless drills with volunteers, preparing to respond to an oil spill in nearby Cook Inlet. Over and over, he’s practiced setting out containment booms, floating barriers designed to slow the spread of slicks.

Photographs by Acacia JohnsonStephen Payton has spent a lot of time planning for disaster. The environmental program coordinator for the Seldovia Village Tribe in Southcentral Alaska and a board member of the Seldovia Oil Spill Response Team, he’s helped organize countless drills with volunteers, preparing to respond to an oil spill in nearby Cook Inlet. Over and over, he’s practiced setting out containment booms, floating barriers designed to slow the spread of slicks.