RE: Oil exec not convinced about climate change - shock1 Aug 2021 01:23
Wyloe that is an interesting opinion but it does run counter to the evidence.
One thing that science has become very good at is data gathering. The data tells us that global average temperatures have increased by about 1C over the last 100 years. The question is just how does that compare with historical global temperature changes.
A useful comparison would be with the period following the last ice age which was at its peak about 18,000 years ago. At that time global average temperatures were about 4C or 5C cooler than today.
Over the next 8,000 years or so temperatures rose causing extensive melting of ice and a rise in sea level of about 100 m, reaching present sea level about 6,000 years ago. So the 4C or 5C rise in temperature that caused this warming and a dramatic rise in sea level could be equated to a rise of about 1/2C (half a degree C) per 1,000 years.
There is no argument that this rise was due to natural causes and interestingly CO2 concentrations over this period accurately track the temperature changes. It does demonstrate a link between CO2 levels and atmospheric temperature.
No doubt those that share your opinion would claim therefore that the current warming is due to natural processes. OK so exactly what are the natural causes that over the last 100 years have led to a rate of warming approximately 20 times faster than during the period following the last ice age (1C per 100 years v 0.05C per 100 years). Remember that we are very good at data gathering yet we cannot identify natural causes that have caused this very fast rate of warming.
At the same time CO2 within the atmosphere has risen quite sharply, much of this due to gases emitted during the Industrial Age and in particular the last 100 years. Once again we see the link between CO2 levels and atmospheric temperature, only this time the source of this rise in CO2 is human activity.
I respect your opinion as a climate change sceptic but I must point out that the huge amount of data now gathered and the models derived from this certainly point to increasing temperatures driven by rising levels of so called greenhouse gases.
You are correct to point out that atmospheric temperatures do vary over time. However the very big problem that the sceptics have to explain is the very rapid rise this time, unprecedented in previous warming periods, and the correlation between warming and CO2 levels. Any natural process powerful enough to drive warming at the pace we are now seeing would be very obvious and easily measurable. And yet none have been identified. At the same time science explains the warming as being linked to CO2 levels and the mechanisms are well understood.
(To be continued)