I almost agree. What I don't agree with is "exact". We don't have to distinguish between human activity causing 50 % of the problem and our activity causing 35 or 65 %. Anywhere in that range makes us significant in my view. Others might say anywhere from 20 % upwards but I'm not going to fuss about the exact number.
I agree that something above 20% from human activity would certainly be a problem, and one that we could work to reduce.
I do agree we need to understand our contribution to the climate change that is underway as we type here.
What is much more difficult to determine is how serious the consequences will be. The speed with which we take action and the magnitude of the resources we commit should be based on the seriousness of the consequences. Which I think is implied by your comment.
The consequences of sea level rise are serious. Close to a majority of the US population lives along the coast, or soon will, although not all of those are within a meter of two of the current sea level.
If CO2 levels keep climbing without mitigation then we know that we'll have a 200 foot rise in sea level. We just don't know how fast. We'd better figure that out really, really soon. If we don't want to commit too many resources to mitigation yet then we sure has hell should be committing lots to determining what the risks are.
I agree. That really is my main point.
And the current atmosphere, in which global warming proponents literally demonize anyone who suggests that, is both unhealthy and unscientific.
Perhaps now is the time to really emphasize nuclear power, using the newer designs that are now available.
Religious belief does not constitute scientific evidence, nor does it convey scientific knowledge.
Belief gets in the way of learning--Robert A. Heinlein
How can I possibly put a new idea into your heads, if I do not first remove your delusions?--Robert A. Heinlein
It's not what we don't know that hurts, it's what we know that ain't so--Will Rogers
If I am entitled to something, someone else is obliged to pay--Jerry Pournelle
If a religion's teachings are true, then it should have nothing to fear from science...--dwise1