Landfills
(just playing devils advocate…)
Uhm… how about this suggestion… if we 'swap' enough mass (and I have
no idea how much is 'enough'), we alter the moon's orbit around the Earth
(if not the Earth's orbit around the Sun (assuming we send the mass off to
the sun, or otherwise don't keep it 'local')).
I'm no expert on the topic, but it seems reasonable that 'slight'
changes in either case may cause relatively severe changes in the
weather/geological systems.
Just something to think about,
Keith
"Look at all these rain-forests… let's cut some down… our children's
children will never miss 'em"