Human CO2 emissions

Fig 6: Temperatures fall while CO₂ stays constant at 270ppm. Source: http://euanmearns.com/the-vostok-ice-core-and-the-14000-year-co2-time-lag/

Even further back in time the 600 million years plus record of the rocks that make up our landscape, consistently show that changes atmospheric CO₂ either follow or sometimes (Fig 6) ignore changes in global temperatures. A global ice age for example occurred some 435 million years ago towards the end of the geological period of time known as the Ordovician with atmospheric CO2 concentrations of well over 4,000 ppm, that is almost ten times today's miserly 422 ppm.

With such a complete absence of correlation, it seems that we should not worry about our fossil fuel emissions. So, we can be confident that the just over 1^O C of Global Warming that has occurred since 1750, or 1850, was not caused by the ~140ppm increasing in atmospheric CO₂ concentrations (and which is roughly double the human emissions, as noted above). Reducing emissions would not reduce current atmospheric concentrations, but could curtail the increase in crop yields, and the greening of the biosphere that has occurred since atmospheric concentrations exceeded their previous ice age maximum of 280-300 ppm.

Net Zero is a pointless and destructive target, and CO₂ emissions do not need to be curtailed, nor does CO2 need to be 'captured' and buried underground.