Simply fixating on the potential negative effects of climate change instead of focusing on efforts to combat it will not help our planet. However, climate change predictions are the reason these efforts matter, and they provide valuable insights as to how we should take action.

According to former NASA climate research head James Hansen, the effect of climate change we should be most focussed on isn't the warming of the atmosphere. It's the rising sea levels.

Hansen told New York Mag that he doesn't think the atmosphere will actually warm as much as some have predicted by the end of the century, but he does think that sea levels will rise significantly due to melting polar caps.

"I don't think we're going to get four or five degrees [Celsius] this century, because we get a cooling effect from the melting ice. But the biggest effect will be that melting ice," he asserted. "In my opinion that's the big thing – sea-level rise."

In a paper published last year, Hansen warned that continuous reliance on fossil fuels could increase sea levels by several meters in just a period of 50 to 150 years.

That seems like a long time, but Hansen's predictions are significantly greater than the Intergovernmental Panel on Climate Change's projected range of sea level rise of 30 centimetres (~1 foot) to just under a metre (3.2 feet).

https://www.sciencealert.com/climate-change-could-make-the-planet-practically-un...
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Whether this guy is off the hook or not is validly up for debate.... Because to put a range of 50 to 150 years before 'several' metres of sea level rise assumes itself is, in my opinion, controversiality describing is own demise.

Sure, all he can say is all he can say but the climate deniers exist on such pithy statements and it's had to disagree when put to the sword in argument!