It's lazy to say that the world and humanity will not end (literally no one is suggesting the world will end, and the worst predictions do not predict humanity will end). It's also lazy to say that reasonable analysis is labelled as far right. The quote you posted can't be debated.
Taken to their logical conclusion, increasing population, increasing CO2 output, increasing pollution, and environmental change suggest that sometime soon things are going to reach a tipping point in the broadest sense, financial, socioeconomic, environmental. This is reasonable analysis that also can not be debated and should not be labelled left or right. Saying "I believe a future technology we have no hint of now is going to emerge soon enough to be able to have enough of an impact on this problem to materially affect the current trajectory" is the ultimate laziness. Renewables/nextgen nuclear seem at best to be able to take a bite out of current output not take a bite out of atmospheric CO2. And keep in mind we need that tech now, not in 50 years. Citation welcome, but please don't cite something lame.
But for me it really comes down to the hard fact that we are borrowing against the future for our present. The morality of what we're doing is incontrovertibly bad. I would not want to be my own grandchild, I would be freakin pissed at how selfish and lazy my grandparent had been. Granted humanity has always done this, but our ability to consume and pollute has grown exponentially.
Bell Labs Unix -- Reach out and grep someone.