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How Cool! London Homes Heated By Subway Waste Heat; Polluters Pay More to Park in Madrid

London is capturing all that hot air in subways and piping it into homes for heating, and in Madrid, cars that pollute pay more to park.

Drones can easily check for cracks in wind turbine blades, malfunctioning solar panels and endangered species that could be harmed by them.

One technology uses sunlight on nanoparticles to completely break down oil; another is a computer model that predicts where an oil spill will travel.

Manufacturers are already making and experimenting with LED hues that affect health, mood and growing conditions for indoor crops.

Nest has been able to crack the smart home market like no other company.

An engineer's dream of towing icebergs to bring people fresh water turns out to be technically feasible, but does it make sense?

Known as the Oscars of Innovation, these awards include a virus that produces energy and a tool that calculates solar glare.

Google wants to bring the Internet to remote areas of the world and fill coverage gaps using a network of wind and solar-powered balloons.

In a unique production process, methane emitted from wastewater treatment is converted to hydrogen.

Ascent Solar and Pratt & Whitney are two of the companies honored for green inventions.