First thing I noticed is how you cherry picked individuals, tying them as representatives as the entire science community. More importantly, you're saying that because some got it wrong, it has to be all wrong.
The idea that there was a consensus in the 70s about imminent climate change was actually a myth, exaggerated by media at the time and deniers today. In truth, they were actually leaning towards a more long term scale of when the climate would change. As a matter of fact, the popular theory back then was that scientists figured the earth would end up cooling, when even then they more in the warming bracket of overall consensus.
Media and deniers continue to cherry certain scientists and quotes as representative of the entire climate change debate.
There has been research showing that while the earth as a whole does ultimately create more CO2 than humans, the earth balanced itself on those numbers alone. Our use of fossil fuels have created a small addition true, but it disrupted the balance in which the earth had. We're raising the earth's temperature by three degrees Celsius and that alone has caused more weather changes in a single human lifetime than any other period. The past 14 years alone have shown record breaking extreme weather patterns, like the natural disaster forest fires for instance.
http://www.iac.ethz.ch/people/knuttir/papers/knutti08natgeo.pdf
Data has actually been fairly agreeable with the way Earth has reacted and the idea that we don't have any say in climate change as it is presently doesn't match with the data at all.
A good source for current climate date:
http://climate.nasa.gov/