These underground reservoirs of steam and hot water can be tapped to generate electricity or to heat and cool buildings directly. 4 min read Geothermal energy has been used for thousands of years ...

Wooden screens over windows helped to keep houses cool by letting air inside while ... All the important buildings like the House of Wisdom and Caliph’s Palace were in the centre of the city.

Thousands of buildings across the United States are staying cool with the help of cutting-edge batteries made from one of the world’s simplest materials: ice. When electricity is cheap ...