This is knowledge that is of little consequence for the future of the planet. None of these can be a certainty. We have to settle for the limited assurances that are available. The world would be uncertain enough without human risk-taking. In the pursuit of science-based technology as elsewhere, we will inevitably take risks.
Commercial pressures drive some of the risk-taking.
Some of it reflects the kinds of beings that we are. We are not consistent in seeking or avoiding risk. There have been attacks on the predictions, placing the science under unusually intense scrutiny from many different disciplinary perspectives. The science has weathered the attacks well. Recent changes in climate patterns, although far from offering any proof of global warming, are entirely consistent with the predictions.