Comment Incandescent will be best for the environment. (Score 4, Insightful) 278
I already have a number of friends who's rooftop solar panels generate more electricity than they use. Once people reach that point, the biggest impact to the environment will be manufacturing --- either with poisons like mercury in CFL bulbs or with dirty semiconductor fabs and lead on circuit boards for LEDs.
Hard to beat a plain glass globe with a metal wire for clean recyclable environmentally friendly materials.