LED's, energy savers or environmental disaster?

LM741N writes: Gallium Arsenide has now been listed as a carcinogen. http://www.oehha.org/prop65/prop65_list/Newlist.html Given the increasing usage of gallium arsenide, the main constituent in LED's, and their recent championing as more efficient light sources in recent news stories and Slashdot, there may be significant environmental concerns as related to their disposal. Morover, workers in industries using the substance may be at risk of cancer as well. Thus arguments that LEDs are more environmentally friendly than fluorescent lights containing mercury may be totally specious.