Ask a self-described "environmentalist" ... I think I can dig one up somewhere...
1) Like all things, nuclear power is an idea which is manifested by the nuclear industry. And an industry has many facets, and many responsibilities. Nuclear power, the fifties dream of endless free power, creates nuclear waste. As an environmentalist, I find the idea of toxic waste that is impossible to store, irresponsible to dump, with a half life of (I think) 25 thousand years worth thinking about. Much of this nuclear waste will remain hazardous for thousands or even millions of years, leaving a poisonous legacy to future generations. Luckily, we're only making 10 000 tonnes a year of the stuff, world wide.
Safe nuclear power? Try looking at Mayak, in the Russian Urals. Oooh, I feel safer already. Here is the Greenpeace site:
http://archive.greenpeace.org/mayak/index.html. But as environmentalists, what would they know? How about Amnesty:
http://www.jamestown.org/pubs/view/mon_003_066_000.htm#009
But don't waste your time listening to me...
2) Space and development. Hmmm. Those pesky environmentalists are forever harping on and on about the space program aren't they? Mmmm. Walking around with placards, I'd say. Why would we be against that? There are a few more pressing problems right here on earth, for anyone to bother throwing comments at space programs.
Maybe somebody has, *sigh*. But thats a weird view you have of environmentalists there. We're not an anti-technology bunch of luddites. (We are using OpenACS for example). We just don't want the technology we use to solve our problems to be radioactive for tens of thousands of years.
Caveat: All misspellings and opinions mine.