Actually, it's not in the least bit secret, but you wouldn't know that from the MSM who have categorically failed once more to report on a study which contradicts the IPCC approved narrative.
The paper suggests that, although there is a small underlying trend of warming connected to CO2 (which we are all aware of anyway otherwise this planet would be a freezing hell hole), the conclusion is that most of the warming is not from CO2. They even go as far as to say ....
These conclusions are contrary to the IPCC  statement: "[M]ost of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations."
In other words, the IPCC is wrong, CO2 is not the driver of climate, the majority of the increase is natural and there really isn't any need to cut our economic throat by clamping down on CO2 emissions.
Of course, this one study is no more conclusive proof than anything else, but it amazes me that what should be considered as essentially a good news story is given absolutely no coverage. Why is it that the very real probability of climate change being almost entirely natural and, therefore, the need to spend trillions of dollars mitigating it unnecessary being ignored?
You'd have thought - what with the ballooning credit crisis - that governments all over the world would be dancing with joy at the news, but it seems that they are not. Why would that be?