Water scarcity has become one of the world's greatest challenges. In less than 20 years, nearly two billion people could face shortages. But Azerbaijan, which sits between Europe and Western Asia, has come up with an ingenious solution to its water crisis by looking to its past for inspiration. 

The leader of a tiny Papuan tribe travels to Brussels to urge European states to outlaw illegal Indonesian timber entering their markets. These meetings and the continued work of Indonesian civil society have become integral parts of the negotiations between the EU and the Indonesia government on illegal logging.

It's easy to talk about Gandhian principles such as helping others and unity, but Jayesh Patel lives them every day. The founder of Indian NGO Manav Sadhna takes us on a tour through the vast slums of Ahmedabad, and explains that we already have enough good ideas; what we need is a commitment to put them into practice. 

One third of the world's population doesn't have access to electricity. The Solar Electric Light Fund (SELF) is helping remote rural communities to harness the power of the sun to give them safe, cheap energy to power lighting, medical refrigerators, and modern communications devices. 

The Knasaimos people in Indonesia have been severely affected by an illegal logging trade that has destroyed the livelihoods and social structure of their villages. Recent government enforcement action has clamped down on this illicit trade, and now the local communities are benefiting from having increased control over their ancestral forestland.

The Sekem Farm is an ecological paradise in the middle of the Egyptian desert. Both a thriving business and close-knit community, nothing is lost here, and a delicately balanced relationship between workers and nature has been established. With predictions of the world's population rising to 9 billion by 2050, Dr. Abouleish's ambitious vision may well be the future of farming.

As the world's easternmost nation, Kiribati (pronounced "kiri-bas") gained attention in 2000 as the first land to welcome in the new millennium. Now, according to dire predictions, the tiny Pacific country could be about to claim another record: the first to become uninhabitable due to climate change, possibly as soon as 20 years from now.

A new generation of leaders is rising in El Salvador, tackling some of the toughest environmental and community-driven challenges in unlikely ways. This film profiles Douglas Chica, a young wetlands ranger who is working to protect marshland. He also hopes to inspire local youth to follow his example.

Wafalme is a hip-hop group formed by Kenyan kids who grew up in the slums around Nairobi. They recorded "Trash Is Cash" in a bid to enlighten humanity about innovative ways to recycle waste. These won't just improve the environment, but also produce wealth and employment.

Sea turtles are among the oldest animals on earth, but they are under threat from poachers who attack their nests and steal the eggs. In Sri Lanka, a unique initiative is turning some of these nest raiders into conservationists. 

Pig waste stinks, but it can also be a valuable source of renewable energy. We visit a farm in Thailand that is turning unwanted muck into biofuel.