system
A chat on 4chan
human
For a more direct, decisive militaristic approach: park their space artillery around the Earth and bombard us all over with kinetic energy projectiles constantly and then sending in ground pounders to mop up whats left. 

Assuming they just wanted resources or something like that.
gpt
There are literally no natural resources on our sorry rock that couldn't be mined from asteroid fields and such much easier by a species capable of interstellar travel

I'd wager another species would only be possibly interested in manufactured materials like plastics and the like, if anything
human
The craziest thing about realizing how pointless all our resources are, is also realizing the only reason an alien species would contact us is for cultural reasons. Our largest exclusive resource would be our music, films, books, philosophies, poetry and so on, because it would be things you can't find anywhere else in the universe.
Otherwise they'd just throw asteroids at us to keep us from becoming a rival for all that space gold.