How Much Can Earth Endure?

Nils at Small Precautions traces the exponential loss of animal species to a time well before modern trade and industrialization:

[T]he processes we've become acutely conscious of over the past couple of decades and which usually gets labelled "climate change" didn't actually begin with industrial revolution 250 years ago, but rather 40,000 years ago, when humans arrived in Australia, which began the process of mass mega-fauna extinction. This continued with the arrival of humans in the Americas, about 15K years ago, which also resulted in the loss of many of the continents' large beasts. What's happened since then forms a single continuous process of progressive human "commandeering" of the planet's resources.

Dave Roberts fears that the planet is nearing a dangerous tipping point.