The alternatives are to prevaricate and to try to avoid taking any decisions until there are no options left, by letting the options expire.
Tony Blair has supported Kyoto and green energy with a vague generality of interest and a tiny modicum of effort. He has fervently tried to appear to do something (anything?) whilst avoiding any real decisions.
Now he flaunts his "green" credentials by claiming that nuclear is the only viable alternative. The sole justification is a failed energy policy caused by Government intransigence.