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Not sure it matters that we knew. World population in 1950 was only 2.5 billion. We definitely knew 40 years ago we’ve done little over that time as the population grew to 8 billion.

Today we’re using more coal than ever.

https://www.cnn.com/2022/12/16/world/coal-use-record-high-cl...

Staying below the 1.5C goal is now impossible and we will breach it within 10 years.

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George Bird Grinnell of Grinnell Glacier fame in Glacier National Park, wrote during a 1926 trip [1]:

"...the glacier is melting very fast and the amount of water coming from it is great. All these glaciers are receding rapidly and after a time will disappear."

[1] https://www.repository.law.indiana.edu/facpub/747/

That's interesting but it seems too early to be caused by anthropogenic climate change. The Little Ice Age extended into the 19th century, during which those glaciers presumably expanded. The end of that era would have resulted in the glaciers shrinking back.

Without more context, it doesn't seem like he's talking about climate change.

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