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Hi!
This is a very good question! And the answer is no, this isn’t the first time.
For example, about 55 million years ago there has been a fast increase in the Earth’s temperature, during a period of time called Paleocene-Eocene Thermal Maximum (PETM). The hypothesis is that this increase in temperature could have been caused by a sudden release of greenhouse gases into the atmosphere.
The main consequences for the Earth were big changes in ocean and atmospheric circulation, the spreading of tropical forests towards the poles, and there was also a major extinction of marine species, especially in the deep sea.
This time period is very interesting for palaeoclimate scientists because they are trying to use this example, which could be similar to what is happening to the Earth now with a rapid increase in greenhouse gases, to understand what may happen to our future climate.
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