First, the physical cause of the present global warming is known, the absorption spectrum of the GHGs. It is explained here, a site that is posted by the American Institute of Physics, the largest scientific society on this planet.
The Carbon Dioxide Greenhouse Effect
As for the effects of the increase that the man created GHGs have already created, you don;t need models to see them. Just look at the recession of the glaciers in Glacier National Park, and the mountains of the West. In the acidification of the oceans, and the die-off of the coral reefs.
Solutions? Already wind is far cheaper than even dirty coal, and solar is almost on parity with dirty coal, and will be far cheaper than dirty coal in less than five years. And, unlike nuclear, there are no dangerous by products. And geo-thermal is only just beginning. China is investing more in solar and wind than any other nation. Texas is investing more in wind than any other state, and is beginning to make big investments in solar.
Every Scientific Society, every National Academy of Science, and every major University in the world has policy statements that AGW is real, and a clear and present danger. Against that, we have the rants of obese junkies on the AM radio, fake British Lords, and an undegreed ex-TV weatherman.