By Dr. Orr Karassin.
DURBAN, South Africa (Nov. 28, 2011) — Two years ago, negotiations over a new worldwide agreement to reduce greenhouse-gas emissions “rolled over and died” at the United Nations Conference on Climate Change in Copenhagen. Attempts were made to revive them at last year's conference in Cancun. This year's conference, which opened today, must try to “stabilize the patient’s condition.” In the meantime, fewer than 12 months remain until the previous agreement, known as the Kyoto Protocol, expires. Despite ...
By Benjamin Kahane.
For hundreds of years, humans have used wind to pump water and grind grain, mostly with small windmills. Large, modern wind turbines are used to generate electricity for individual use and to feed into the electric grid. Wind turbines generally have three blades and, because higher altitudes yield higher wind velocities and lower turbulences, the turbines are mounted on tall towers to capture as much energy as possible. As the blades turn, the central shaft spins a generator to make electricity.
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