Isn’t a 1970s global cooling warning an example of why we should decrease greenhouse gas emissions?
by: Dana1981, Master of ScienceA few decades ago we were warned of a growing hole in the ozone layer. We responded by reducing CFC emissions, and have essentially solved the problem.
In 1999 we were warned of potential computer crashes due to the Y2K bug. We responded by fixing the computer software and solved the problem.
In the 1970s few scientists warned of an imminent ice age
http://www.wmconnolley.org.uk/sci/iceage/
but one crude climate simulation (supported by a computer program witten by James Hansen) showed that if sulfur dioxide emissions continued to increase at the rate they had been as of 1970, they could eventually trigger an ice age.
This was a reasonable conclusion, because the SO2 emissions had been causing global cooling from 1940-1970, but our SO2 emissions peaked in 1980 and have been declining ever since. See pages 12-14 here:
http://www.pnl.gov/main/publications/external/technical_reports/PNNL-14537.pdf
So again we solved the problem.
Is this not the case for CO2 now?
eric – try reading your own articles in the future.
“Despite successful measures that have stopped production of CFCs, scientists don¹t expect to see the hole significantly reduce in size for about another decade, Newman says. This is due to the long lifetimes of CFCs already in the atmosphere, ranging from 40 to 100 years. Full recovery is expected in about 2070.”
And the very minor solar irradiance decrease in the mid-20th century played a very small role in the global cooling at the time. If your explanation were true, we should have seen global cooling from 1980-Present.
http://en.wikipedia.org/wiki/Image:Climate_Change_Attribution.png
Isn’t a 1970s global cooling warning an example of why we should decrease greenhouse gas emissions?
2009-12-15 20:46:44
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Tags: Cfc Emissions, Greenhouse Gas Emissions, Lifetimes, Witten, Y2k Bug
Lina Adams
do you really think that we are solving any of the problems?
Iman SW
From NASA “Each year, the depleted region in Earth’s protective ozone layer over the Antarctic, or “ozone hole,” reaches its largest size during a period in September. Data from a NASA satellite are now in, and images created from the data reveal the extent of the hole in 2007 was about average when compared to measurements from the last few decades.”
The same alarmist who are predicting doom and gloom for global warming, were saying around this time we would have an epidemic of skin cancer on our hands if we did not ban CFCs. We do not have an epidemic.
Problem not fixed. Theory wrong, money wasted.
Governments around the world spend billions of dollars to fix the y2k bug. Many countries did not, and did not have any problems. Money wasted.
The sun was responsible for the cooling during the mid century. Sun activity started to decrease at 1940 until the 1960. After that ocean currents were then running negative (la ninas) which was the cause of the cooling.
Edit: You said the problem is fixed for the ozone layer. It is not. You are misleading. As for scientists saying CFCs in the atmosphere having a long life span, that is their way of saving face.
Read the whole article by Jan Veizer. He claims that when sun activity does not match temperatures, then ocean currents match temperatures. The ocean currents were running cold after the sun activity peaked in the 1960′s. during the nineties and 00′s ocean currents are running warm. This explains why temperatures have risen despite sun activity levelling off during the mid 80′s.
Aan
OK…Eric C pointed out that after speniding whatever sum of money, there was no problem. Just what you’re saying so I don’t know why he’s thinking it’s a sign of wated effort.
I still say there is a large enough human population to make a difference. These deniers are making it sluggish, though.