If academics are good for anything (are they good for anything?), then it’s reading stuff that people are interested in (but don’t themselves have the time to read it), synthesising that stuff and presenting it in an accessible way. I’ve spent much of this year reading reports on carbon emissions produced by the UK’s Committee on Climate Change (focusing in particular on its report ‘Net Zero – The UK’s contribution to stopping global warming’), and also reports from the Inter-governmental Panel on Climate Change (mostly Working Group III’s contribution to its 5th Assessment Report and its Special Report ‘Global Warming of 1.5C‘). The output of that reading was a talk I gave at Shrewsbury’s Hmmm Squad yesterday evening at The Old Post Office.
In my talk, I offer six reasons why 2050 is too late (you can access my slides here). Any one of these reasons should be enough to persuade you that the target date be brought forward. Taken together the evidence is overwhelming. As an aide memoire, I condensed the arguments into six images representing six areas of concern:
TINA (there is no alternative to net zero by 2050). It is important to understand that the 2050 target date is NOT a scientific fact and that there are alternatives – they are just politically unpalatable ones.
Poor odds. The IPCC gives us a pathway to 2/3rds odds of keeping below 1.5C; the CCC only gives us better than 50/50.
Feedback loops. There are lots of these. The IPCC does not include feedback loops in its analysis. What it does say is that, if the effects were included, our carbon budget would be reduced by 1/4 (100Gt of a 420Gt budget).
Thermal inertia of oceans. Oceans emit heat, slowly. It causes a time lag – think of the time it takes for a super tanker to make a right turn. System inertia is also not included in the IPCC’s calculations, but 0.6 degrees of warming by 2050 is in the pipeline.
Negative emissions technology (NET). The IPCC reckons that 05-5.0 GtCO2 will need to be removed from the atmosphere come 2050. The biggest CCS plant, the one in Illinois, has so far managed to sequestrate 1.5 MtCO2. Net zero requires NET. Here’s how Kevin Anderson describes it:
Carbon budget. The CCC focuses on nationally determined contributions and % reductions of CO2 from a 1990 baseline. The IPCC warns us that, if met, NDCs will exceed our carbon budget by 113GtCO2. Tim Jackson’s recent analysis suggests that UK emissions will exceed its carbon budget by 2025, and that by 2050 – if the country proceeds along the linear path described by the CCC – the UK will have emitted 5x its carbon budget.
So there you have it. Six reasons why the target of net zero emission by 2050 is a path over a cliff. We mustn’t take that path!