The refrigerators that supermarkets use to keep products fresh pose a major threat to the global environment, primarily because of ozone-destroying refrigerant hydrofluorocarbons (HFCs). Now, a South African supermarket chain is switching to environmentally-friendly refrigerant agents. They save energy, and they're cheaper too.

Melting ice caps, catastrophic hurricanes, floods and drought plunging entire regions into a water crisis. These are the drastic images often associated with climate change. But what's actually being done on the ground to halt global warming? What kind of projects are helping to reduce emissions, inform people and spur them to change their lifestyles?

Each week GLOBAL IDEAS visits a new destination and reports on a new project, so check back often.