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The Tech Museum Awards is an international award and gala ceremony honouring people’s efforts in “technology benefiting humanity.” Individuals, non-profit, and for-profit companies can be nominated and are judged in five categories: education, equality, environment, health, and economic development. These are the 2007 winners in the environmental category.

Emulsified Zero-Valent Iron (EZVI) is a method for cleaning groundwater that has been contaminated by, for example, solvents washed away from machinery. Metal particles surrounded by a membrane of cooking oil attract contaminants, and can be injected directly into the ground, eliminating the need to pump out groundwater to clean it.

Marc-André Ledoux discovered that a harmful algae in Senegal— an introduced species that has reduced biodiversity, blocked irrigation channels, provided habitat for mosquitoes, and contaminated drinking water— can be harvested to provide fuel for cooking. He created a type of floating grapple that efficiently collects the plants, which are then dried in the sun and extruded by machine into a form of charcoal, which can then be burned.
You can find the entire article here http://aboutmyplanet.com/videos/museum-environmental