What people (including here) tend to whitewash with nuclear is the waste. The radioactive waste that takes centuries or millenia to neutralize. Yes, it's kept in concrete bunkers underground and stuff, but no one can guarantee structural integrity of those silos over centuries. An earthquake might hit. A strain of concrete-digesting bacteria might eat through the walls. A war might break out, or simply terrorists. Ultimately, nuclear power contains an inherent and impossible to calculate, but quite real, environmental risk. And it's directed not at us, but at future generations who might have to deal with the cancer and toxicity caused by today's nuclear power. So no, I'm sorry, but nuclear <i>fission</i> is not clean.