COPENHAGEN – Amid a growing wave of concern about climate change, many countries – including Brazil, Australia, the United States, and the members of the European Union – passed laws in the 2000’s outlawing or severely restricting access to incandescent light bulbs. The intention was understandable: if everyone in the world exchanged most light bulbs for energy-efficient compact fluorescent light bulbs (CFLs), we could save 3.5% of all electricity, or 1% of our CO2 emissions.