New York Harbor was a haven of incredible underwater biodiversity--until centuries of pollution turned it into a cesspool. Today, an alliance of architects, restaurateurs, scientists and high school students is working to restore the harbor and protect the city from climate change. At the heart of the effort is a tiny creature with an outsized talent for cleanup: the extraordinary oyster.

The surprise return of beavers to the British countryside is boosting biodiversity, reducing storm-induced flooding and restoring wilderness to a highly manicured landscape. But the industrious rodents are also riling some of their human neighbors. Can the British beavers regain their former glory as powerful ecosystem engineers, or is their new home too domesticated to return to the wild?

Following a revelation that forest fires sparked by live-fire training at the Fort Bragg Army base in North Carolina create excellent habitat for the endangered red-cockaded woodpecker, scientists and soldiers have forged an improbable alliance to safeguard the special bird. Nearby landowners too are pitching in too--setting aside suspicions and animosity to save the species.

Ecuador is one of the most biodiverse places on the planet, yet its wild spaces are among the most threatened. In 2008, the country became the first nation in the world to enshrine the “rights of nature” in its constitution--granting wild species their own legal rights to exist. Today, conservationists are putting that powerful tool to the test as they battle to save biodiversity hotspots.

A decade after the largest dam removal in history, on Washington State’s Elwha River, scientists are chronicling a story of ecological rebirth. Recovering salmon populations are transferring critical nutrients from the ocean into the forests, enriching the entire ecosystem. The Elwha’s revival is an encouraging model for the removal of larger dams in the region and around the world.

Decades of war and unsustainable agriculture have ravaged the rainforest atop Mozambique’s Mount Gorongosa. The devastation threatens the watershed that sustains life in nearby communities and in Gorongosa National Park. Now, park experts and local farmers are uniting to plant shade-loving coffee, which will help restore the forest and ensure a more prosperous future for humans and wildlife alike.