Anton Mzimba has stared down the barrel of a gun more times than he would care to admit. Now he dedicates himself to protecting endangered rhinos.

London-based social enterprise The Restart Project encourages people to use their electronics longer in order to reduce waste.

Artist Mary Mattingly has created a floating food forest that could be a model for how public parkland could be utilized for better public health.

Mr. Sariban is a regular fixture on the streets of Bandung, Indonesia, with one mission in mind: to stop people throwing their rubbish on the floor.

One couple has tested the viability of the electric car to its limits, by driving one in a rally for 10,000 miles -- two thirds of the way around the world.

Robert Bezeau collected over a million plastic bottles in Panama. The sheer volume of plastic pollution prompted the Canadian to work on a novel solution.

Nemah Kawadja is one of Jordan's first female plumbers, and she's helping reduce water waste in a country where every drop counts.

Butterfly numbers are dwindling and many species are disappearing, but one man is working to attract rare butterflies back to city landscapes.

Threatened by poaching and climate change, the iconic hawksbill turtles of the Seychelles have a new friend: local conservationist Vanessa Didon.

Danish food waste activist Selina Juul is credited with helping Denmark reduce its food waste by 25 percent since 2006. Here's how she did it.