Q:

Is there a verb form of "Extinct"?

Is there (modern) verb meaning "to cause to become extinct" please? The desired word would have the same root as "extinct".
The closest I could find etymologically was "extinguish", but its usage is archaic according to this link and, to me, it sounds like more of a synonym than a word with the same root.
As an example:

Humans have accidentally (extinct(v)(past tense)) at least x species in the past 5 years.

To clarify, I am aware of plenty of words that can fill the gap. I was specifically looking for a "real" equivalent to "extinct-ify"

A:

The biological term for a local extinction is extirpation, which does have a past-verb form, extirpated. You can totally say:
Humans have accidentally extirpated at least x species in the past 5 years

As a biologist, I would add "... species from this planet", because otherwise I'm wondering which local area you are referring to.

A:

"Extinguish" is the obvious answer in terms of sharing the same root, but I don't think it holds true in common usage. No one would say, "We extinguished the passenger pigeon." "Exterminate" and "eradicate" are closer, though not perfect.

A:

As as direct answer to the question, no. Not in a modern way.
I know you're asking for a specific word, but I feel the only way to maintain the correct context and meaning would be to rephrase the whole sentence:

At least x species in the past 5 years have become extinct accidentally by human activity .

Any other way would look unusual in my opinion. 
edit to add based on comments
We should probably put accidentally before extinct. 

At least x species in the past 5 years have become accidentally extinct by human activity.

