that there is now a scientific consensus that human activity contributes to global warming
There is something of a consensus but it goes to far to state the debate is completely over. Even assuming that it is over that statement wouldn't mean a lot. A climatologist who believes that the earth would warm by a degree over the next century without human CO2 emissions and would warm by 1.1 degrees with the CO2 emissions would agree with the idea that human activity contributes to global warming, but he might not consider it a serious problem, and is unlikely to think that there would be a near term disaster. The debate is far from over about how much warming will happen, how much of it is caused by human activity, what the effects of the warming will be, how long will it take, and what we should do about it.
Gore claims the debate is over about far more than "human activity contributes to global warming" -
"AL GORE: (takes a deep breath) Well, the debate is over in the scientific community. There are 5 points to the global consensus. Number one, global warming is real, Number two, we are mainly responsible for it. Number 3, the effects are catastrophic, Number 4, we need to fix it quickly, and number 5 it’s not too late. Those 5 elements make up a very strong consensus. And on those points, the debate is over. "
He goes on to say -
"But on the last point, “How long before it might be too late?” The scientists, who I most respect on this question, are now saying, and this is new for them to say, that in their view we have less than 10 years in which to make a significant start in changing the amount of carbon dioxide pollution we put into the earth’s atmosphere or else it will be too late."
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