Is the human race receiving it's karma for what it has done to Earth? Yes.

I think this might be the most useful way to look at this. The main mistake the human race has made might not be what you think. If there is a sin it is the sin of overpopulation.

The problem with overpopulation is mostly what the very poor and starving and the very rich do in life.

The very poor must kill animal species to live that are wild. They must to do things that are bad for the earth in order to stay alive. The same is true of rich people who are too greedy. They harm the planet too.

Do middle Class people harm the world too? They harm the world mostly by there being to many of them poor, middle Class and Rich around the world

But, the karma is mostly upon the adults for overpopulating the world. I'm thinking this is one reason why most of the people dying now are over 30 years of age. Because people younger than 30 aren't dying that much of coronavirus.