Did climate change only really start in the early 90s

Nov 2014
416
ph
Did climate change only really start in the early 90s, if you look at the hockey stick graph, you can argue that global warming started in the 70s, on the other hand, you can also look at the graph and conclude that global temperatures were still around the normal range as late as the 1980s, and that global warming only really unambiguously started in the 90s.
 

Dan Howard

Ad Honorem
Aug 2014
4,890
Australia
Scientists first proposed the concept of CO2 causing a "greenhouse effect" in the 19th century. The global warming trend had been reported right through the 20th century. It was in the 1980s when they started to suggest that human-produced CO2 was effecting the climate.

Global Warming Timeline
 

johnincornwall

Ad Honorem
Nov 2010
7,760
Cornwall
No way back. Britain was populated. Then it was covered in ice and they all moved south. Then it melted and got populated again

etc
 
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sparky

Ad Honorem
Jan 2017
5,169
Sydney
a cursory examination of the global temperature record from the Hadley center indicate a clear warming signal starting in 1980
on the left column is the years with a row for the months

https://crudata.uea.ac.uk/cru/data/temperature/HadCRUT4-gl.dat

the Hadley center was founded by Margaret Thatcher ,
educated as a graduate chemist she had a concern about the human influence on climate
as an adjunct to the British meteorological office it was the first government institution to collate the data
it is one of the most respected climate analysis center
 

AlpinLuke

Forum Staff
Oct 2011
27,185
Italy, Lago Maggiore
Scientists first proposed the concept of CO2 causing a "greenhouse effect" in the 19th century. The global warming trend had been reported right through the 20th century. It was in the 1980s when they started to suggest that human-produced CO2 was effecting the climate.

Global Warming Timeline
Exactly, more than "climate change", it would be better to discuss the impact of human industrialization on the natural evolution of climate. Global climate knew, has been knowing and it will always know less or more wide fluctuations [positive or negative, as for mean temperature] because of the most different causes [astronomical ones included ...].

So the best question would be "how much does human industrialization affect the natural fluctuations of global climate?"

This would generate a range of possible answers from "in a totally irrelevant way" to "in a very relevant way".
 
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GogLais

Ad Honorem
Sep 2013
5,470
Wirral
So the best question would be "how much does human industrialization affect the natural fluctuations of global climate?"

This would generate a range of possible answers from "in a totally irrelevant way" to "in a very relevant way".
Yes, as the geological record shows, the Earth’s climate has been subject to dramatic and often sudden changes. There are long term cycles associated with the sun, the earth’s orbit, etc but what we are doing now is adding to that instability by churning out more CO2 into the atmosphere. At the least it’s a dangerous experiment.
 

AlpinLuke

Forum Staff
Oct 2011
27,185
Italy, Lago Maggiore
Yes, as the geological record shows, the Earth’s climate has been subject to dramatic and often sudden changes. There are long term cycles associated with the sun, the earth’s orbit, etc but what we are doing now is adding to that instability by churning out more CO2 into the atmosphere. At the least it’s a dangerous experiment.
Pollution is never positive. This is clear and probably with climate change we should consider the opportunity to spend some money to improve the quality of our life and the biosphere of this planet ...

Anyway, we should consider also other greenhouse gases, in particular methane [which is well more effective than CO2 and which has dispersed in the atmosphere by extraction activity [Assessment of methane emissions from the U.S. oil and gas supply chain] and water vapour.
 

sparky

Ad Honorem
Jan 2017
5,169
Sydney
Before 1980 , there is only noise in the trends , no discernable patern , after 1980 , warming is unmistakable
as for the causes , it's not clear at all ,
Human activity is the usual suspect and I'll go along with it ,
CO2 attribution is somewhat more dodgy ,
the main issue is that if it is ...mainly ...CO2 then there is no problem , there are physical limits to CO2 greenhouse effect