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There's a lot more involved in climate change on earth than just co2 in the atmosphere, and in fact, co2 is not even the most important (or even the most effective) greenhouse gas. That would be methane.
Things like where the earth is in it's rotation around the sun, or planetary wobbles known as Milankovich cycles can have dramatic effects on climate for tens or hundreds of thousands of years, by altering the amount of heat recieved from the sun. More than anything, these cycles can effect how carbon is stored on the planet. When carbon is released into the atmosphere it quickly combines with oxygen to create carbon dioxide gas. This mass of carbon dioxide can work to either warm or cool the planet (think of it like one of those warm/cool bags). It can go from a large biomass like a forest, into the atmosphere, and from there into the ocean. It's more the distribution of carbon that is the controlling factor in climate.
All that being said.... since we dump 6 billion cubic tons of carbon into the atmosphere, and they can find only 3 billion..where's the rest? Well sudden growth of the rainforests has been a side-effect of carbon-dioxide rich atmospheric conditions, and it's been shown that they've absorbed upwards of 3 billion cubic tons per year of carbon dioxide and effectively used it to fuel growth (we all remember grade school, plants live on carbon dioxide and throw off oxygen as waste). Destroying those rainforests is bad, but in essense, the earth is a closed system capable of dealing with dramatic increases in carbon dioxide. There's enough carbon/methane trapped in the earth itself to turn the planet into a waste, and it's also been shown that it has happened before, if memory serves correctly about 55 million years ago.
We as humans don't help the situation... polluting and destroying the environment is not ok. But let's be honest here, there's no way all the panic about what we're doing is justified, nor is it worth all the billions of dollars poured into the coffers of those on the global warming soap box.. would all that money/time/effort not better have been spent teaching people better earth husbandry and doing it for the reason of having a clean planet? People don't learn well while panicked. They fall to desperate measures, trying to fix it however they can, even if it doesn't make sense.
All the mishmash and politics have no place in the real science of the matter.
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