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The environmental issue here isn’t really that they will re-enter, but that we will need to use lots of rockets to replace them. Rockets produce a ton of greenhouse gasses, but no one really cares because we don’t launch a lot of them. However, if we start launching rockets far more frequently to replace disposable space debris, then we’re gonna start hitting big numbers.
There isn’t a weight limit for the overhead compartment on any airline I’ve flown.