RE: Consensus science
The main difference, between say, medicine and climate change is that we have lots and lots of evidence to back up the consensus regarding medical treatment and no [real] evidence to back up the consensus regarding the effects of climate change.
If you break your leg you know that the consensus (setting, immobilising the break, physiotherapy etc) has been arrived at through a great deal of trial and error - we don't blood-let any more because we can see it won't make the bone mend any quicker and we don't sacrifice a chicken to ward off infection.
But with climate change, we don't have enough evidence to say X will definitely happen unless we do Y and stop doing Z - because the things we are talking about (I'm talking about warmaggedon here, not just a few hot summers or a bit more snow in January than expected) have not happened.
Put it this way, if you had a condition completely new to medical science, with no historic precedent how eager would you be to let them amputate both your arms on the basis that a consensus of doctors agreed it was probably best for you to lose your arms? Personally I would want to keep my arms until they had a better idea of what was going on.