It's the transition speed that is most important to consider. Past climatic changes have caused extinction events of varying degrees, but they happened on a tim

It's the transition speed that is most important to consider. Past climatic changes have caused extinction events of varying degrees, but they happened on a timescale of tens to hundreds of thousands of years. We are changing the world's environments in equally or even more dramatic ways (ocean acidification, climate change, habitat destruction, deforestation, overfishing) on a timescale of just a couple hundred years that is currently driving the unprecedented extinction rates [1]. We could raise CO2 and the temperature slowly over thousands of years and the biosphere would have time to adapt, but it's the rate of current change that is so devastating. [1] https://www.theguardian.com/environment/2014/sep/29/earth-lost-50-wildlife-in-40-years-wwf https://www.theguardian.com/environment/2014/sep/29/earth-lo...