Kyoto is a pollution trading protocol. That means, if you are cleaner you can sell your pollution credits and if you are a polluter then you have to buy them from others. This adds a direct financial cost to the products you are importing/exporting based on your ability to cut emissions. This US protocol is simply words, there is no actual incentive to any of the nations involved to cut their emissions.
The US is a very odd country. Individual states (for example California) have excellent records on attempting to cut CO2 emissions, but the federal administration until very recently chose to believe (rough quote from their chief scientific advisor) that Global Warming was a fallacy constructed by other nation's scientists to damage US growth.
No one has proved that Carbon Sinks or similar imaginary technology could/would work. What has been proven is that unless action is taken to cut emissions NOW! then the problem will spiral even more out of control than it already is. The US treaty does not address the urgent need to shift world reliance from oil to renewable energies... and therefore will kill millions over the next 30-50 years.