A very good factual video. I've posted that graph to Crick numerous times, he/she still taf.
John Robson is a professor of American History and film maker. He is not a climate scientist.
The eleven points of his film:
10) We are still in an ice age. This interglacial has been cooler than the previous four and the Holocene interglacial might well be coming to an end.
I have noted we are still in the Quaternary on several occasions. I have also noted repeatedly that we are past this interglacial's peak temperature and that suggestions that the warming of the past 150 years is simply this interglacial cycle's warming is unsupportable for several reasons. Poster ding has repeatedly noted that the Holocene has been cooler than prior interglacials but has provided no support for his implication that all interglacials should hit the same peak.
9) Modern thermometers were invented during the Little Ice Age
Robson lefts unsaid what he wants his viewers to think: that this bit of coincidence has heightened the record since then. He leaves out several points: Per agreement between all the major climate organizations, the limit of what is considered reliable global instrumented temperature data is 1850. That is past all three instances of the LIA cooling, all of which were regional.
8) The temperature of less than 50% of the Earth's surface has been accurately measured. The rest of the data is "made up".
That data is not made up. It is very carefully interpolated using multiple parameters and known processes. If Berkely Earth, for instance, has a weather station in downtown Berkeley and one in downtown Los Angeles and wants to estimate the temperature halfway between them, it will make use of winds, air pressure gradients, humidity, cloud cover, time of day, season and other weather parameters to make that estimate. It is most assuredly not simply "made up".
7) CO2 has been higher for most of the Earth's history and has fluctuated widely.
It has been significantly lower for more than 14 times the span of human existence. The current rate of change of CO2 and temperature is many times higher than anything seen in the geological record short of D-O events. What we are currently undergoing is not a D-O event.
6) The 97% consensus only applies to the basic consensus not catastrophic climate change.
Robson wastes several of his points demonstrating that scientists are not alarmists and revealing to us that the terms "emergency", "catastrophe" and "crisis" lack any quantitativity
5) The direct effect from CO2 is small, feedbacks are uncertain and IPCC scenarios are based in part on feedbacks
IPCC emissions scenarios and shared socioeconomic pathways (SSP) assume different feedbacks and thus different climate sensitivities because they make differing assumptions as to socioeconomic and technologic development.
4) The IPCC doesn't use the terms emergency, crisis or catastrophe to describe the effects of global warming.
If you thought they did, you don't understand science basics.
3) The IPCC denies any connection between global warming and extreme weather events
This statement is false. From AR6, WGI, Summary for Policy Makers
Headline Statements from the Summary for Policymakers
A. The Current State of the Climate
A.1 It is unequivocal that human influence has warmed the atmosphere, ocean and land. Widespread and rapid changes in the atmosphere, ocean, cryosphere and biosphere have occurred.
A.2 The scale of recent changes across the climate system as a whole – and the present state of many aspects of the climate system – are unprecedented over many centuries to many thousands of years.
A.3 Human-induced climate change is already affecting many weather and climate extremes in every region across the globe. Evidence of observed changes in extremes such as heatwaves, heavy precipitation, droughts, and tropical cyclones, and, in particular, their attribution to human influence, has strengthened since AR5.
A.4 Improved knowledge of climate processes, paleoclimate evidence and the response of the climate system to increasing radiative forcing gives a best estimate of equilibrium climate sensitivity of 3°C, with a narrower range compared to AR5.
B. Possible Climate Futures
B.1 Global surface temperature will continue to increase until at least mid-century under all emissions scenarios considered. Global warming of 1.5°C and 2°C will be exceeded during the 21st century unless deep reductions in carbon dioxide (CO2) and other greenhouse gas emissions occur in the coming decades.
B.2 Many changes in the climate system become larger in direct relation to increasing global warming. They include increases in the frequency and intensity of hot extremes, marine heatwaves, heavy precipitation, and, in some regions, agricultural and ecological droughts; an increase in the proportion of intense tropical cyclones; and reductions in Arctic sea ice, snow cover and permafrost.
B.3 Continued global warming is projected to further intensify the global water cycle, including its variability, global monsoon precipitation and the severity of wet and dry events.
B.4 Under scenarios with increasing CO2 emissions, the ocean and land carbon sinks are projected to be less effective at slowing the accumulation of CO2 in the atmosphere.
B.5 Many changes due to past and future greenhouse gas emissions are irreversible for centuries to millennia, especially changes in the ocean, ice sheets and global sea level.
2) Most climate studies are based on RCP 8.5
This is bullshit.
1) Climate models show too much warming both on the surface and in the air. It is very likely that future warming will be moderate and not alarming
A model that employs a high ECS or TCR or both will show greater warming than one that uses low ECS and TCR values. Does that surprise anyone?
0) Economists tell us that if warming sticks to the low emissions scenarios, it is not worth the expense of attempting to stop it.
Low emissions scenarios INCLUDE atttempts made to stop warming.
