I think cosmic rays are the real cause of climate change. I feel there has been some warming (less than 1 degree C) due to human activity (deforestation and urbanization) but the biggest impact on climate looks to be from the amount of cosmic rays reaching the earths atmosphere.
Cosmic rays ionize the atmosphere which water droplets then condense on. A decrease in the cosmic rays will lead to a reduction in cloud cover which heats up the earth, a increase in cosmic rays will lead to a increase in cloud cover which cools down the earth. The amount of cosmic rays that reach the earths atmosphere are mostly determined by the earths magnetic field. The two main things that change the earth magnetic field are Milankovitch orbital cycles and Sunspot activity which are what I and many believe are the real drivers in climate change.
The only computer models that have been able to go back and time and successfully forecast global warming/cooling have been based on Milankovitch orbital cycles and Sunspot activity, NOT CO2.
CO2 has long been a theory of climate change, increased CO2 in the atmosphere has been shown to follow the warming and not the driver.
Principia Scientific http://principia-scientific.org
Committee For A Constructive Tomorrow (CFACT) http://www.cfact.org
Climate Depot http://www.climatedepot.com
Watts Up With That http://wattsupwiththat.com
RSS Satellite Temperature Data
No cosensus among scientists!
Consensus among scientists crumbles (Forbes) http://www.forbes.com/sites/jamestaylor/2013/02/20/as-the-consensus-among-scientists-crumbles-global-warming-alarmists-attack-their-integrity
Slaying the Dragon (book) http://slayingtheskydragon.com
Climate Change Theory http://www.climate-change-theory.com
CO2 Insanity http://co2insanity.com
Climate Change Dispatch http://climatechangedispatch.com
Climate Clash http://climateclash.com
Ice Age Now. http://iceagenow.info
Climate conservative consumer http://www.c3headlines.com
Global climate cooling facts http://www.climatecooling.org
Temperature over the last 15 yrs. http://c3headlines.typepad.com/.a/6a010536b58035970c017d3dff2dda970c-pi
Temperature over the last 10,000 years. http://2.bp.blogspot.com/_F2aVRfr4Y0Q/TFxFAPLTBBI/AAAAAAAAAzE/zLXs5x43Kcs/s1600/gisp-last-10000-new.png
Comparison of atmospheric temperature with CO2 over the last 400,000 years. http://www.geocraft.com/WVFossils/last_400k_yrs.html
More temperature charts. http://www.c3headlines.com/modern-temperatures-chartsgraphs.html
The science is settled. http://www.spinonthat.com/CO2_files/O2_N2_IR_absoption.html
The global warming myth. http://firsthandweather.com/blog/all-posts/global-warming-myth
Articles about how increased CO2 COOLS the atmosphere.
Video called "The Great Global Warming Swindle". Some good information to think about even if it all may not be true.
The case against anthropogenic global warming http://www.earth-climate.com/CaseAgainst.html
Long range weather http://www.longrangeweather.com/global_temperatures.htm
Astronomically based decadal-scale empirical harmonic climate model http://www.sciencedirect.com/science/article/pii/S1364682611003385
Orbital Resonance and Solar Cycles http://semi.gurroa.cz/Astro/Orbital_Resonance_and_Solar_Cycles.pdf
The seasons and the earth's orbit. http://aa.usno.navy.mil/faq/docs/seasons_orbit.php