So they were underestimating global warming till now

The permafrost in most areas of the Northern Hemisphere may melt by 2100, according to this news, unleashing irreversible global warming catastrophes. It’s funny when they say,

“If that much near-surface permafrost thaws, it could release considerable amounts of greenhouse gases into the atmosphere, and that could amplify global warming,” said lead author David Lawrence, with the National Center for Atmospheric Research. “We could be underestimating the rate of global temperature increase.”

What’s there to underestimate? Environmentalists all over the globe have been crying horse that the greenhouse effect is an impending danger that is not centuries away. And even if it is, why do we want to leave an uninhabitable world to live. I hope by the time we turn the entire planet filthy our generations will be able to travel to other friendly planets.