I have followed the MOOC Energy, the Environment and Our Future from Dc Richard Alley of Penn State University. It is true that we emit CO2 and the increase of temp is what is predicted by the model. So the most probable is that we are responsible for the heat increase. 99.9 % of scientists have arrived at the same conclusion.
https://www.futurelearn.com/courses/energy-environment-future
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Chris, water vapour is a more potent green house gas than CO2... This doesn't make sense, it's just mainstream media nonsense, carbon tax.
The Giec is composed of scientists; not journalists.
Yes, plants have absorb CO2 for 300 million years to transform it in O2 and make the planet a better place for animals, but these are evolutions over million of years, what we are facing today is an evolution over 100 years due to emission of CO2 from industrial activity. No other change in our environment can explain it.