According to the Environmental Protection Agency, only about 10 percent of all electronics are currently recycled in the U.S. That is why our landfills are being filled with toxic lead, mercury, cadmium, copper and barium. And that is clearly not good enough people.
Do You Recycle Your Electronic Gear? - Gearlog
That's where you can help. Building a green PC means you can be part of the solution by using all lead-free parts that are also more energy-efficient.
PC Magazine: The Green PC