Sales of compact florescent light bulbs have burgeoned in recent years as more and more environmentally-conscious Americans seek to take advantage of their energy savings and extended usability. But with increasing numbers of florescent bulbs making their way into landfills, a new problem has emerged with regard to the release of mercury, and this has some health officials concerned. According to CNET News, an average florescent bulb contains about five milligrams of mercury, which while not very much, is nevertheless still a threat for groundwater contamination. Crash efforts are thus being undertaken to spur more recycling, and environmentalists are hopeful this mercury issue won’t dim florescent’s bright future.