Right, laugh at that -- and the insistence that 100 ppm of CO2 can make the atmosphere heat up, melt the icecaps, and drown everybody.
My main concern with the CO2 rise is the acidification of the oceans. The question is how acid an environment can fish live in and how fast can they adapt? Large loss of fish would create famine conditions. People can always move to higher ground. In fact one person I know has already liquidated their property in Miami and moved to higher ground near Orlando.
https://climate.nasa.gov/climate_resources/24/