There is nothing, nothing here on Earth that couldn't be much more easily mined in the outer solar system, or any other solar system for that matter. The idea of Earth having resources that would make it necessary (or even feasible) to go through all the trouble and mine this planet is simply not viable. In fact, it's horribly dangerous for any alien civilization to come here for this purpose. Pretty much every ounce of material on this planet is contaminated with self-replicating organisms that would wreak havoc on any foreign ecosystem.
There are still some nefarious reasons why an outside civilization may attack us, for example to bolster a slavery-based economy or for religious purposes. There are certainly other reasons we can't even think of yet. But resources? No.
Territorial reasons are also void, since we can't project any meaningful power beyond close earth orbit and we couldn't even mount a serious planetary defense come to think of it. Pretty much anyone could just strip mine the entire solar system - including the Moon - without us being able to do anything about it.
There are still some nefarious reasons why an outside civilization may attack us, for example to bolster a slavery-based economy or for religious purposes. There are certainly other reasons we can't even think of yet. But resources? No.
Territorial reasons are also void, since we can't project any meaningful power beyond close earth orbit and we couldn't even mount a serious planetary defense come to think of it. Pretty much anyone could just strip mine the entire solar system - including the Moon - without us being able to do anything about it.