I have no real understanding of it. I'm certain that those who are in charge of directing the planet's weather patterns take all of these things into consideration.
[And this is why farming is so mystifying. Chekov is about as far removed from certain aspects of nature as a person who grew up on a planet can get.]
Very little is left to nature where I come from. Droughts and fires and storms are regulated so that no one is hurt by them when they happen. Maybe we have made everything more complicated than it needs to be, and maybe there will be unexpected repercussions in the future, but there's always enough food and extinction rates have fallen sharply in the past century, so I think that we must be doing something correctly.