paulj
Expedition Leader
The greenhouse gas theory can be traced back to 1900, when Svante Arrhenius proposed the idea that an increase in CO2 could produce warming. Being a resident of cold Sweden he thought that was a good idea.
I don't recall much about the warnings in the 70s about impending ice age. There, of course, have been lots of speculation about what triggered the ice ages, and how long it might be before continental ice sheets might again advance. I suspect the more alarmist talk was coupled with nuclear winter warnings.
However our ability to model the earth's climate, and to make observations, has advance significantly since the 1970s. Our knowledge of past climate has also advanced significantly, using ice cores, deep ocean cores, tree rings, lake bottom cores, and other indicators.
paulj
I don't recall much about the warnings in the 70s about impending ice age. There, of course, have been lots of speculation about what triggered the ice ages, and how long it might be before continental ice sheets might again advance. I suspect the more alarmist talk was coupled with nuclear winter warnings.
However our ability to model the earth's climate, and to make observations, has advance significantly since the 1970s. Our knowledge of past climate has also advanced significantly, using ice cores, deep ocean cores, tree rings, lake bottom cores, and other indicators.
paulj
