No, we can’t.
First of all, we would never get internal political agreement to try it. Secondly, it is immoral and I doubt whether our military would carry out such an order. Thirdly, if we tried it the rest of the world would unite to stop us ... and rightly so.
You are confusing the ability to do something with the will to do it.
If we as a nation decided to turn Afghanistan into a radioactive cloud we could do so before breakfast time tomorrow. And, let’s face it, the rest of the world couldn’t do jack squat about it.
L