Why: Light-emitting diodes are an energy-efficient option for lighting in buildings and homes, but they are still expensive.
Key innovation: Its low-cost process produces LEDs on the same equipment used to make semiconductors.
Why: Biodegradable plastics that aren't made from petroleum offer several environmental benefits.
Key innovation: Its polymer-¬manufacturing processes use carbon dioxide to make plastics needed for packaging.
Why: Retrofitting existing buildings is a cost-effective way to increase energy efficiency.
Key innovation: Mass-produces windows with energy-saving features such as coatings and gas insulating layers.