The IPCC’s RCP8.5 Was Shown To Be Implausible Nine Years Ago
By H. Sterling Burnett
In late April, the Intergovernmental Panel on Climate Change admitted that Representative Concentration Pathway 8.5, or RCP8.5, the high-emissions climate model scenario that dominated climate research and policy, was “implausible”
However, for more than a decade, the IPCC had made no effort to correct those who claimed RCP8.5 was the “business-as-usual” pathway, which projected global temperatures would rise by 4.3℃ or more by 2100 with all manner of “end of the world” results.
Behind closed doors however, they knew full well it did not represent ‘business as usual’, as it assumed a doubling of the human population, assumed coal use at five times what was actually being burned, and assumed CO2 does drive temperature.
Governments and alarmist organisations repeatedly promoted RCP8.5 during treaty negotiations to beat climate negotiators into multiple unjustified climate treaties restricting the use of ‘fossil fuels’.
The fact that RCP8.5 was “implausible” should have come as no surprise because many climate researchers were on the record noting from the outset that RCP8.5 was very unlikely and shouldn’t be treated as ‘business as usual’.
It never was, the the IPCC knew it. They just didn’t tell anyone.
Yet that didn’t stop the vast majority of scientists publishing in the peer-reviewed literature and speaking to the mainstream media from treating it as such, calling on government leaders to impose a rapid transition away from ‘fossil fuels’ to prevent the disastrous social, economic, and environmental outcomes that RCP8.5 forecast.
The Heartland Institute critiqued RCP8.5 from the start, noting it was not just implausible but likely impossible as far back as 2017. It was debunked in detail in Climate Change Reconsidered II: Fossil Fuels in 2019.
So, concerning the IPCC’s belated admission, in the immortal words of celluloid Die Hard hero John McClane, “Welcome to the party, pal.”
Better late than never.
Sadly, in the interim between the time RCP8.5 was officially released as “business as usual” and the IPCC’s recent mea culpa, tens of thousands of peer-reviewed climate studies used it.
By early 2020 alone, researchers were publishing roughly 20 studies per day using it, with estimates of more than 8,500 papers in 18 months.
There were many reasons to consider RCP8.5 a false rallying point for climate policy from its inception, foremost among them perhaps being the fact that not enough recoverable coal exists in the world to produce the assumed fivefold increase in use by 2100.
In addition, the human population is not on any foreseeable track to increase to the 12.6 to 14.5 billion range assumed in the RCP8.5 scenario.
The IPCC and the lapdog media are treating this conclusion as if it’s a discovery, but it is not. RCP8.5’s implausibility, indeed impossibility, was known to its promoters from the start. But instead of jettisoning it, they built a massive edifice of publications, laws, and regulations based upon its false predictions.
In this, they simply followed the advice of an early climate alarmist, the late Dr. Stephen Schneider, who admitted that being honest about the science would undercut efforts to get governments to enact the policy prescriptions the political left desired.
“On the one hand, as scientists we are ethically bound to the scientific method, in effect promising to tell the truth, the whole truth, and nothing but — which means that we must include all doubts, the caveats, the ifs, ands and buts,” Schneider told Discover magazine.
“On the other hand, we are not just scientists but human beings as well, and like most people we’d like to see the world a better place, which in this context translates into our working to reduce the risk of potentially disastrous climate change.”
“To do that we need to get some broad-based support, to capture the public’s imagination, [which] of course, means getting loads of media coverage, so we have to offer up scary scenarios, make simplified, dramatic statements, and make little mention of any doubts we might have,” Schneider continued.
