September 2007 Archives

Geothermal heat pumps are more efficient and cleaner than coal or natural gas and avoid fossil fuel cost fluctuations.

Geothermal heat pumps are more energy efficient because they transfer existing heat and require minimal electricity to operate.

Online game Energyville illustrates the trade offs involved in the renewable, nuclear and fossil fuel sources.

In the old days, it was invading hordes that was the primary threat to China’s 6,400km Great Wall, which acted as a buffer against the Mongols and other threats over countless centuries. Today, it is the weather that it fears most.

From GreenBang