it's to try to attain what the human race wants,
being a interstellar species (which means that you wanna conquer planets out of the solar system)
the air is, as i said COΒ² and CHΒ² (carbon dioxide and methane)
soo combining with the deadly toxic elements, the rain would make acid rain
that's a problem for us
and yes
i think i have answered most of ur questions
