"Nuclear Power is the answer to global warming" is one of those common statements that lacks a factual basis.
If all the existing uranium was exhausted, it could meet current global electricity demand for - wait for it - 3 (three) years.
Current NP energy output (438 plants) meets 3% of global energy needs (NP does electricity; most energy is used as heat).
When the CO2 from the energy required to mine, mill and enrich the uranium, and to build and decommission the nuclear power stations is taken into account, nuclear power entails CO2 emissions roughly equivalent to gas powered stations.
This theme is developed on : http://www.greenhealth.org.uk/Nuclear.htm , with links to an important source document.