Biology professor Guy McPherson, from University of Arizona, believes there is nothing we can do to prevent the mass extinction of the human race.
He claims human-driven climate change will bring about the sixth mass extinction of humankind within the next decade.
He told Newshub: “It”s locked down, it”s been locked in for a long time – we”re in the midst of our sixth mass extinction.”
But professor James Renwick, a climate scientist at Victoria University, says people should take the doom-laden warning with a pinch of salt.
He said giving up the fight against the “biggest issue humanity has ever faced” is “not really helpful”.
Instead of deterring people to take action, professor Renwick hopes the warning will prompt humanity to curb catastrophic climate change.
He said: “This is a really big issue and the consequences could be catastrophic.
“Though certainly [humans won”t all die off] in 10 years or even 1000 years.”
He said: “I can”t imagine there will be a human on the planet in 10 years.
“We don”t have 10 years. The problem is when I give a number like that, people think it”s going to be business as usual until nine years [and] 364 days.”
“We”re heading for a temperature within that span that is at or near the highest temperature experienced on Earth in the last 2 billion years.”
Humans should just cherish their time on Earth while they can, he added.
He said: “I think hope is a horrible idea. Hope is wishful thinking. Hope is a bad idea – let”s abandon that and get on with reality instead. Let”s get on with living instead of wishing for the future that never comes.
“I encourage people to pursue excellence, to pursue love, to pursue what they love to do.
“I don”t think these are crazy ideas, actually – and I also encourage people to remain calm because nothing is under control, certainly not under our control anyway.”
It comes after experts claimed biblical floods driven by climate change could leave London completely underwater.
Meanwhile a NASA video of melting Arctic ice showed an area roughly the size of Florida disappearing in little more than a week.