And here's why it's a load of crap....
There is no science because these Eco-babblers cannot control for carbon from other sources than man. CO2 emissions from volcanoes to start. There are volcanoes that erupt for more than a decade at a time spewing more carbon into the atmosphere in a day than the US could hope to do in years. This carbon is unaccounted for in "Eco-science" as it pretty much has to be. Volcanic eruptions are random and the severity of the emission is random as well. But, even if they made progress and could account for these volcanoes, there are additional underwater volcanoes erupting all the time as well with the same characteristics as the above ground volcanoes. Again, this carbon is unaccounted for.
Usually when someone brings up the volcano argument the Eco-babbler will trot out the trusty ice-core sample and begin his obfuscation. Typically the argument goes something like there have always been volcanoes and we can assume that we have no greater or no worse volcanoes than there have always been. Hmmmm....really? A random event is always equally as random, well there's a theory. In any event, by careful examination of the ice-core we can determine whether the carbon comes from man or from nature. Yup! Different kind of carbon. We'll leave the boring science out and take them at their word.
But, wait a minute! What about the thousands of coal fires burning out of control all over the world. It wouldn't matter if coal was burnt by man in a furnace or whether it was started by accident in a mine or by lightning striking a coal vein on the ground. How could you tell. Well, you can't. There have been coal fires burning for hundreds and even thousands of years. There's a coal fire burning in Australia that's been burning for 6,000 years. There is a famous anthracite coal fire that has been burning in PA since 1960. Coal fires are especially bad in China and India. In China, coal is plentiful and close to the surface. Peasants typically have a community coal pit that is available to retrieve coal and take it home. These are especially susceptible to lightning strikes and grass fires.
Documentation of coal fires and their effect
So why aren't we all trying to find a solution to putting out coal fires instead of instituting a "cap and trade" system? I think we can all agree that these should be put out and would be a good step toward the common goal of a cleaner environment.
The reason is, that's not what this is all about. This is about redistribution of wealth from rich countries to poor countries. That's why we aren't interested in solutions to problems. The eco-BS is conducted with the same disingenuousness as the oil drilling argument. "We need the problem to exist so we can pursue our uneconomic solutions."