There's a great distinction that Norwegian philosopher and deep ecologist Anre Naess makes between long-range and short-range movements which I think helps explain the disagreement a little.
In the short term, we need to reduce CO2 for our own survival. Nuclear helps this, so from this angle it seems counterproductive for anyone who claims concern over the environment to object to its development.
In the long term, humans need to transition away from a society based on resource extraction, and long term damage. It's a lot harder to see how nuclear helps with this- mining and enriching uranium are destructive processes, and nuclear waste needs containment for thousands of years.
Our current situation is pretty critical, so I think it's pretty legitimate to think that we might need to make some compromises between the long and short term. But I think the distinction makes it a lot clearer about why people seem to be shouting passed each other sometimes.
Sorry if this is a dumb question, but who's the db0 community?