Here's a renowned scientist publicly, on the release of his new book The Revenge of Gaia, proclaiming an outlook in some ways even more gloomy than mine. And he's far more qualified to harbor such an outlook!
The climate centres around the world, which are the equivalent of the pathology lab of a hospital, have reported the Earth's physical condition, and the climate specialists see it as seriously ill, and soon to pass into a morbid fever that may last as long as 100,000 years. I have to tell you, as members of the Earth's family and an intimate part of it, that you and especially civilisation are in grave danger.It gets worse, but when he writes, "We [in Great Britain - sls] could grow enough to feed ourselves on the diet of the Second World War, but the notion that there is land to spare to grow biofuels, or be the site of wind farms, is ludicrous", I wonder how he thinks that can happen with the thermohaline circulation   slowing down in response to freshening of North Atlantic waters due to ice melt.
Nobody knows specifically what's going to happen. It seems likely, though, that we'll wind up wishing it hadn't, and that we'd had more of the foresight James Lovelock represented.
Sure, there are lots of smart optimists who probably think Lovelock is a crank. It seems to me that they are in denial.