The definition of clean tech or clean technology is the group of jobs that help reduce pollution, find sources of renewable energy, and increase energy efficiency.
An example of clean tech is a company that makes solar panels.
An example of clean tech is a research group designing electric cars.
An umbrella term for systems that are more environmentally friendly and more energy efficient. Examples are solar power, wind power and LED lighting. Clean tech focuses on developing clean energy and conserving energy. Nanotechnology plays a part in clean tech because it is used in the development of solar panels, fuel cells, biofuels and solid state lighting. See nanotechnology.