Guardian: Researching the history of ecosystems, it is not long before you make an arresting discovery. Great abundance of the kind that exists in the tropics – or existed until recently – was once almost universal.
With a very few exceptions, every major ecosystem had a megafauna; every major ecosystem witnessed vast migrations of mammals, birds or fish; every major ecosystem possessed an abundance of animal life orders of magnitude greater than current abundance in the temperate nations. In some cases…

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