OneWorld UK: The controversy over the possible health hazards arising from Britain’s switch from traditional light-bulbs to low-energy lighting is a small example of the way that the need to tackle climate change is being seized on by snake-oil salesmen around the world to push their products. Take biofuels. Oil is a major contributor to global warming, they say – so let’s run cars, trucks and buses on fuel derived from crops. Lured by the possibility of profits and quick-fixes to a …