Tucked into an otherwise quiet bend south of Pismo Beach, Oceano Dunes may be California's most dangerous state park. Towns near the park, which draws more than a million trucks and dirt bikes a year, are besieged with air pollution, crime and accidents - even a mass shooting last year.
Surfers in Russia's far eastern region of Kamchatka have reported ocean water pollution so bad that it's poisoning them, and may behind a mysterious mass die-off of sea life along the peninsula's Pacific coast.
Summer in Australia use to be something we yearned for: long, lazy days spent by the beach or pool, backyard barbecues, and games of cricket with family and friends. But recent summers have become a time of fear.
The shift makes it cheaper for some of the wealthiest communities to replenish their beachfronts, which are increasingly under threat from more frequent and intense storms, rising seas and other effects of climate change.
Contaminated water sickened hundreds of people and forced an unusually high number of beach closures around the Twin Cities this summer. As the season wraps up, public health officials are looking for ways to prevent future outbreaks of waterborne illnesses.