[PaulAJ]

Back in the 70s there was indeed a concern (no stronger than that) that we might have been heading for a new ice age over the next few centuries. That concern was based on the fact that we are in an interglacial period and ought to start thinking about how and when it might end, and what we might do about it. Ice ages and interglacials are caused by variations in the Earth's orbit and tilt, and calculations suggested that the current interglacial is coming to an end.

However it then turned out that global warming due to CO2 was happing way faster and way more than any potential cooling. The scientists weren't wrong: the cooling effect is still there. Its just completely swamped by all the things we are doing to the atmosphere.

[patrickg_zill]

Only a "concern"? This "concern" seems rather definitive and is on official letterhead.

https://pbs.twimg.com/media/DkAo-sWUwAAmZa7.jpg