Sure, it does not cost much to say that. Cost and risks are a relative thing, and 'through the roof' is subjective. You have to compare with the other possibili

Sure, it does not cost much to say that. Cost and risks are a relative thing, and 'through the roof' is subjective. You have to compare with the other possibilities. No energy is clean. With PV, the cost of treatment of wastes (silicon tetrachoride for instance[1]) and the risks associated with their pollution if not treated are also a problem, especially if we want to make PV substantially more used than it is now in proportion. http://www.washingtonpost.com/wp-dyn/content/article/2008/03/08/AR2008030802595_2.html http://www.washingtonpost.com/wp-dyn/content/article/2008/03...