According to a study by the Quaternary Environments Network, at the last glacial maximum (the end of the last Ice Age) there were a total of 6.1 million square km of tropical forest, in two different categories. In the Holocene era, meaning the modern day, it’s more than doubled to 13.43 million square km. Keep in mind that the total amount of land area in the world has decreased since the Ice Age from 162.78 million square km to 149.85 million today.
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