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A reader comments that scientists incorrectly predicted a coming ice age in the 1970s. That’s correct. But there’s a big difference between these two trends.
Grist, an environmental news site, gives the following explanation:
Today, you have a widespread scientific consensus, supported by national academies and all the major scientific institutions, solidly behind the warning that the temperature is rising, anthropogenic CO2 is the primary cause, and it will worsen unless we reduce emissions.
In the 1970s, there was a book in the popular press, a few articles in popular magazines, and a small amount of scientific speculation based on the recently discovered glacial cycles and the recent slight cooling trend from air pollution blocking the sunlight. There were no daily headlines. There was no avalanche of scientific articles. There were no United Nations treaties or commissions. No G8 summits on the dangers and possible solutions. No institutional pronouncements. You could find broader “consensus” on a coming alien invasion.
Quite simply, there is no comparison.
For more, read this.