As a scientist myself (though not an environmental scientist), I can say that if I started to find evidence that goes against something that has been believed for many years, I'd be more interested in studying it, not trying to hide it.
With regards to your last point, this may well be true -...
The global temperature has risen since the industrial revolution, correlated to the increase of CO2 in the atmosphere. There is also proof that this extra CO2 has come from man-made sources. Don't know what there is to not agree on to be honest :shrug: