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I've got a weird question: if it became feasible to do lots of mining on other planets and bring it back to Earth, at what point will it be a problem where the mass of material on Earth starts to become a problem?

Odd question I know, but I've often wondered this.

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Earth is massive. Pretty much nothing we can do on a human scale is going to impact that. To put it in perspective taking the entire raw iron ore mining output is only 5.3916492×10^-13 of the Earth's mass. (used a 2014 estimate)

Honestly I'd worry about heating up the atmosphere too much from the resources being delivered before mass even vaguely comes into the picture unless we figure out space elevators.

I don't think it's a big problem, as earth mass is already increasing my quite a few tons per day, from comets burning up in the atmosphere. If the asteroids are refined and processed in space, which makes more sense than trying to land them, it should be a non-problem.

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