Which is bogus. Have you read the IPCC report? I have. The prediction that estimate is based on is a worst case prediction. Actually it is even worse that that:

Which is bogus. Have you read the IPCC report? I have. The prediction that estimate is based on is a worst case prediction. Actually it is even worse that that: it is a non-dynamic model designed specifically to give maximally bad outcomes as an impossibility conservative bounding exercise for the things that we don’t know how to model. The scientific consensus is not what is being stated in alarmist messaging. And the IPCC estimates assume no attempt is made to manage climate change, even things which will be done anyway like building new dams and waterway bypasses to handle greater precipitation events and put water to productive use. Those same Malthusian arguments made on the supposition of zero human ingenuity have been shouted in earnest alarm for the past two centuries. And every time they have been wrong. This time is no different.