In the heart of Melbourne, Australia, lies a 87-square-meter, zero-waste home inspired by nature. It could provide a blueprint for sustainable housing of the future.

British horticulturalist Adam Alexander collects, grows and saves endangered vegetable varieties, in an effort to preserve the genetic diversity of edible crops.

This biologist-turned-surfer builds boards made out of plastic waste and uses them for expeditions that highlight global issues around plastic pollution.

Sharks are crucial to maintaining a balanced marine ecosystem, but populations are under threat. This South African scientist uses tracking technology to identify and protect areas that are critical to their survival.

Demand for air conditioning is booming -- along with its electricity needs. Can antiquity provide low-energy alternatives?