I'm taking it up with you. The RATE at which species are currently going extinct is high in a historical context. You claim that's not the case but have presented NO evidence actually supporting that contention.
Try again or concede.
Are you serious? They don't know the past or present extinction rate.
See graphs below.
They don't even know how many species have existed or exist today. Let alone the rate they have gone extinct.
Have you never heard of the fossil record or just never thought what you might see in it?
Your attempt to link extinction rates to "man made global warming" — rests on a comparison of the probability of an observed event in the real world with that of the ‘same’ event in a hypothetical world without "global warming.”
It relies on correlation and causation. Extinctions have causes - often multivariate - but determinant. That human activity, via warming and habitat loss, are a primary cause of extinctions since the beginning of the Industrial Revolution is heavily supported by evidence.
Give me a break. You are so caught up in your religion of global warming that you will grasp at any straw no matter how ridiculous it is.
You simply do not know what you think you know.