A prototype catamaran waste collector disposes of plastic trash from the seabed. It will travel at a speed of two knots, and stay close to the shore, where it can collect up to two tons of garbage.

On Mount Boutmezguida in Morocco's Anti-Atlas mountain range, fog is serving as a foundation for a new technology that's boosting the population's water supply.

Highly efficient stoves in Rwanda are significantly helping to reduce the demand for wood. Their design and construction makes them easy and intuitive to use.

A Spanish entrepreneur has designed a biodegradable urn containing a seed that allows human remains to turn into new, green life within a few years. He has already sold more than 20,000.

Southern Nigeria is affected by massive and expanding gully erosion, an advanced form of land degradation. The root causes of gully erosion are complex but climate change is a major culprit. In Nigeria, the impact is clear: loss of farmland and vegetation, isolation of villages and loss of life. Now locals are calling for government aid to tackle the problem.

Food security is an ever increasing problem. In Kenya, for instance, maize, one of the country's staple foods, is particularly hard hit. But some in far-away Germany are working on a solution.

Spanish entrepreneurs are bringing new meaning to the words "green energy." They've designed a plant pot that produces electricity. And it's all down to some helpful bacteria.

Overfishing and demand for their gill rakers in Chinese medicine are threatening the majestic manta rays off the coast of Mozambique. But they have a champion in marine biologist Andrea Marshall.

Fishermen on the tiny island of São Tomé and Príncipe off Africa's west coast depend on their fishery. But big trawlers are destroying the ocean habitat and their earnings. Now they're taking a stand.

A young Tanzanian engineer has created a water filter that absorbs hazardous substances. He hopes his invention will help the 70 percent of households in his country without clean drinking water.