Almost 50 nations made progress on Friday toward a "Green Fund" to help poor countries fight global warming but hosts Mexico and Switzerland said a full U.N. climate treaty was out of reach for 2010.
Concrete is not often the greenest material choice, particularly since concrete production is one of the largest single sources of carbon emissions globally. But, for wind turbine towers, the use of concrete bases can provide a number of significant benefits, including reducing the amount of concrete needed for the footings for a tower by more than two-thirds.