I can give a bit of background here as I know Ian Dunlop, having once been a member of the WA Greens where he was an outstanding figure.
Hence Ian Dunlop is allowed to be particular pessimistic in his assessment whereas many others are less so.
As for the Milankovich Cycles they do indeed influence CO2 levels since they initiate warming changes on land and ocean that can trigger the release of CO2 from the deep ocean into the atmosphere. However, the melting Greenland Ice Sheet is having the opposite effect, diluting the "Atlantic Conveyor" so that the CO2 at the bottom of the ocean is remaining there, rather than coming to the surface, especially in the North-East Pacific, as it would normally. I cannot refer you to a specific paper on this issue as I am trying to connect the dots myself.
Yours faithfully
Claude very badly
The wildflower-rich south west of WA (=Western Australia) has suffered from a long term drought since 1977. This same year was the year when British Columbia warmed by about 2 degrees C, and I have been working why these events occurred simultaneously.I ran across a critique of the Spratt & Dunlop white paper, by a number of mainstream scientists. In general they felt that the conclusions of the white paper were beyond the IPCC projections, and do not reflect a scientific consensus, which is no surprise. One substantive critique is that "lethal temperatures" should be taken to mean that at least a few people would die, but not massive numbers of people as implied by Spratt & Dunlop. The tropics would not necessarily become literally uninhabitable by 2050, according to the peer reviewed study that addressed the issue.
Hence Ian Dunlop is allowed to be particular pessimistic in his assessment whereas many others are less so.
As for the Milankovich Cycles they do indeed influence CO2 levels since they initiate warming changes on land and ocean that can trigger the release of CO2 from the deep ocean into the atmosphere. However, the melting Greenland Ice Sheet is having the opposite effect, diluting the "Atlantic Conveyor" so that the CO2 at the bottom of the ocean is remaining there, rather than coming to the surface, especially in the North-East Pacific, as it would normally. I cannot refer you to a specific paper on this issue as I am trying to connect the dots myself.
Yours faithfully
Claude very badly