The Energy Construct cost-effectively. The author concludes that wind energy has the greatest potential for near-term expansion. However, smaller-scale use of solar, geothermal, biomass, and ocean sources along with current hydroelectric sources could add up to make a significant contribution. The advantages and disadvantages of each renewable energy option are examined. Nuclear energy is also supported by the author as the only way to produce large amounts of emission-free power. The author pays close attention to the safety of nuclear energy and provides a unique comparison of the safety of energy generation from a number of sources. Fossil energy is then examined with
London Underground cooling hot air. Conventional brakes on trains rely on friction to slow the train down, transforming kinetic energy into heat. More modern trains feature regenerative braking systems that can feed the energy from braking back into the power supply, minimising heat generation. This has the additional advantage of reducing the amount of brake dust produced by the trains. London Underground cooling In summer, temperatures on parts of the London Underground can become very uncomfortable due to its deep and poorly ventilated tube tunnels: temperatures as high as 47°C (116 °F) were reported in the 2006 European heat wave. Posters may be