Electrically powered systems that tap the stable, residual heat stored immediately below the surface of the earth to provide heating and hot water for homes and offices. Also known as geothermal heat ...
The name given to a graph published in 1998 plotting the average temperature in the Northern hemisphere over the last 1,000 years. The line remains roughly flat until the last 100 years, when it ...
A hybrid car is one that has both a petrol engine and an electric motor and switches between them according to the driving conditions. It is different from a dual-fuel vehicle, which uses two types ...
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