Envirofit clean cookstove reduces emissions by 80% and uses half the fuel, helping to address the 1.5 million deaths caused annually by smoke and carbon monoxide from open fires used for cooking by over half the world's population. The Miriah Power Windspire is the first vertical-axis turbine that can operate in slow winds using a motor, catching breezes even at 30 feet high making it suitable for smaller areas. Agroplast has developed a process to create urea, a chemical used to make plastics, from pig urine rather than fossil fuels.

1. Top Tech Awards 2008 Green Tech

2. Safer Kitchens Envirofit clean cookstove. More than 1/2 of the world's populations cook on open fires which produce corbon monoxide and smoke which cause 1.5 million deaths. Envirofit has created a stove which cuts emisions by 80% and uses half the fuel. www.envirofit.org

3. Miriah Power Windspire The first vertical-axis turbin that can star in slow winds with help from a motor. It catches breezes at 30 feet making it perfect for smaller areas. www.mirahpower.com

4. Plastics from Pig-Pee Urea is a chemical which comes from fossil fuels which is used to make plastics. Agroplast has created a process which creates this chemical using pig urine. www.agroplast.info