Polling is never a way to settle science.
However it is interesting to see that according to this poll four out of ten Amercicans appear to be more-or less in agreement with Guy McPherson in his assessment.
Poll: 39 percent think it's likely climate change will cause human extinction
6 July, 2017
Nearly 4 in 10 Americans think there's a good chance climate change will cause human extinction, according to a new poll released Wednesday.
The survey from the Yale Program on Climate Change Communication found that 39 percent think the odds of global warming ending the human race are at least 50 percent.
Fifty-eight percent of respondents said climate change is human-caused — the highest number since the program began surveying on the topic in 2008.
About a quarter of respondents said providing a better life for younger generations is the most important reason to reduce global warning, with 16 percent of respondents saying that preventing the destruction of most life on Earth is the most important reason.
The survey was polled 1,266 adults between May 18 and June 6 and has a margin of error of 3 percentage points.
In the meantime this article from 5 years ago is saying that we had five years to keep global warming to safe levels (whatever they are).
Back in 1989 they were saying that we had ten years to act – and talked about 1C as a target
Now some are saying we have three years to get our act together.
These experts say we have three years to get climate change under control. And they’re the optimists
They’d call it “a start”
If fossil fuel infrastructure is not rapidly changed, the world will 'lose for ever' the chance to avoid dangerous climate change