i wouldn't vote for any of the choices.
the kyoto protocol is a commitment by nations to tackle the problem of global warming, accepted by the un and its members as a threat to civilisation and likely to do significant economic and social harm, and not just to coastal states.
the difficulty (for the us) is not in the treaty, but in the implementation/mechanisms.
the uk and many other states are on target to reduce carbon emissions in line with kyoto and previous undertakings. you can debate about the economic effects, but look at the facts. the uk is probably the strongest economy in the eu right now even having paid the price of reducing carbon emissions.
check out the climate change page of the uk sustainable development site for more factual information:
http://www.sustainable-development.g...#climatechange