Not only can we see the causes, we can explain them. People fear the known, more than they fear the unknown. That's why they make up things, that don't exist. It is quite easy to hold dominion over that which does not exist, and that you yourself have created.Human's are amazing, aren't we?
When we have a problem we can't solve we make up a cause we can't see or explain.
Some times you can dry up the puss in your nose by is just wasting the biology off your hands.
While your all sniffing dirt and filtering air, we'll keep wacking the known biology. When you lock down a cure for cancer, you'll have no problem finding buyers. More power to ya! I'm cheering for you, in the mean time, if you'll let us, we'll try ta shoo a few flies out a'the barn.
You should probably change "known biology" to currently accepted Bull ****. Because with regard to mule deer declines, over the last 30 years, there is no biological basis, to support predator control, as a means to increase deer numbers. It has been tried, and it is still being tried. And that trend line is still pointed down, regardless of any snap shot of the present.