Iain: The bathroom is getting to be a pretty depressing place. First low-flow toilets, then shower heads, and now light bulbs. Next, the greens will want to ban tubs in new home construction for using too much water and push for legal limits on how hot your shower can be. Sound ridiculous? Think again. This kind of thing really highlights the distinction between traditionalist conservationism and watermelon environmentalism (green on the outside, red on the inside).