From the Lemelson site:
Improving Life Through Sustainable Invention
Today’s world needs inventors focused on sustainable change. The $100,000 Lemelson-MIT Award for Sustainability celebrates individuals whose inventions and innovations enhance economic opportunity and community well-being in developing and/or developed countries, while protecting and restoring the natural environment.
The $100,000 Lemelson-MIT Award for Sustainability is bestowed on inventors whose products or processes are viable and sustainable, and have high potential to improve the quality of life for future generations. The award serves to increase awareness of local or global sustainability issues and inventors working in these critical areas, and also supports continued inventive work of these individuals.