I didn't notice you offering any health warning with the link, heric. In fact I'd have said that on balance you sounded approving rather than neutral about it.

The Sierra Club stat is certainly noteworthy, but I'd be wary of reading too much into it. For one thing, I wouldn't be surprised if many single-issue campaigners preferred to promote their conservation agenda through other agencies. For my part I would always give support to Greanpeace ahead of the Sierra Club because I see it as better at campaigning. More imaginative; more effective. Incidentally when I was cycling round Alaska a few years ago, the Sierra Club was claiming to have nearly a million members, and I've seen figures much higher than 550,000 even quite recently. Is it shrinking?