Home Depot has debuted a new light bulb especially for Earth Day: the Philips 60-Watt replacement LED bulb. Retailing at a steep $49.97, the bulb is supposed to last for 25 years and provide the same type of light as the traditional incandescent lights. If every bulb in the United States was an LED, the U.S. would save $3.9 billion and avoid 20 million metric tons of carbon emissions each year …
