by Dr. Susan P. Krumdieck, Professor in Mechanical Engineering, University of Canterbury
In my previous blog, I translated the current language of the
2oC climate change target into an engineering concept of a global warming “failure limit” associated with carbon fuel production. For this part of the analysis, I will use the units more commonly used by the media – GtCO
2 – which means the cumulative emissions failure limit to maintain temperature rises below
2oC is around 3000 GtCO
2 with a probability greater than 66%.
Suffice it to say that a
2oC temperature rise would pose an unacceptable risk to our civilization and most of the world ecosystems. That seems quite a dramatic claim, but there is pretty good certainty that the heat input involved in that
2oC temperature change would be sufficient to melt global ice, raise the sea level and cause uncertainty enough to risk, alter, damage, or destroy 80-90% of the investment in real estate, infrastructure, agriculture and organization that humanity has made to date. It will also mean a mass extinction of species and climate chaos. By “climate chaos” I mean the occurrence of storms, droughts, high temperatures, low temperatures, rainfall, hail stone size, and tornado size that are “unprecedented” and can’t be managed by historical hazard mitigation measures.
I wanted to make this personal by considering the history of CO
2 emissions against the human scale of seven generations of my family. As an engineer, I don’t think of safety limits as “targets.” Failure to reduce fossil fuel production to nearly zero in my lifetime will mean unacceptable hardship for people I know. So how did we get to this point?