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Ocean litter is a global problem. These Greeks are acting locally to clean up the Aegean.

First came the day trips for foreigner tourists to the shantytowns. Now, young Westerners are living in formerly no-go areas — with yoga classes and sushi restaurants following. Business is booming in Rio de Janeiro's favelas, but some residents complain they're being priced out of the market.

The growth of the country's farmed salmon sector has reached such a critical point that, if not addressed, may cause "irrecoverable damage to the environment," a government report says.

Ghost Fleet, a gripping new documentary about modern-day slaves in the global fishing industry, follows Patima Tungpuchayakul, a Thai woman who's devoted her life to freeing men from forced labor.

"This is all wrong. I shouldn't be up here. I should be back in school, on the other side of the ocean," activist Greta Thunberg tells leaders at a U.N. climate conference.

Stacy Jupiter works with the people of Fiji to protect the oceans. Two of her most important life lessons came from the Peace Corps: 1) listen and 2) nothing ever goes according to plan.

Ellen DeGeneres gives voice to a memory-challenged fish in search of her parents in Pixar's follow-up to its 2003 hit Finding Nemo. Critic David Edelstein says Finding Dory is full of laughs.

Thailand's beach resort communities have been recovering slowly since the devastating tsunami struck a year ago. Hotels have been rebuilt and tourists have returned. Residents of the resort towns will commemorate the anniversary, but after that, many want to look forward rather than back.

Some ecosystems have already been irreversibly altered, scientists say. And climate change is wreaking havoc on human health.

The U.S. plans to reduce greenhouse gas emissions dramatically in the next decade. Scientists say it's crucial that the U.S. succeed. Still, many of the positive effects won't arrive for decades.