Yes, the question of "Is there AGW?" is not a debate, at least among scientists. The important question is "how much do humans affect the warming of the earth?" To date, we have not been able to determine this accurately because there are so many factors (our CO2 emissions, emissions from cows, volcanoes, under-sea vents, emissions reduced by trees and plants, increased output from the sun, etc - let alone measuring one of these accurately across the globe). A million variables, no way to isolate any two of them. There might be a "consensus" but that does not guarantee accuracy - I encourage you to write a computer program that will determine the global temperature next year, and see how accurate your prediction is - you will likely find it impossible, because among other things you do not know which volcanoes will erupt and how much more radiation the sun will output. 10-20 years ago, the consensus was that sea levels would rise by a few meters, but that has not happened.