Haven't we done enough damage here?
Maybe it's the way of things that when a species develops the technology to colonize other solar systems those same technologies will cause it to self destruct.
It’s a case of use it before you lose it anyway.
Ceres is the largest known asteroid in the Solar System at present with a diameter of something like 400 miles. Mining its interior to produce a habitat would produce arable alnd nearly equivalent to all of the currently arable land on the entire Earth. This is because very little of the Earth’s surface is arable land. The low gravity conditions of the Asteroid would permit the construction of large interior spaces which provides so much overhead space, an inhabitant would perceive the overhead to be a blue sky much like that of Earth. Only a few thousand feet of overhead space is required for this effect. Such a colony could support human populations numbering in the tens of millions or more.
there is enough water ice in the outer regions of the Solar system to supply enough water to fill multiple Earth oceans. This water is also the source of wcarbon dioxide for plants and oxygen for animals. The asteroids are a readily available for high grade metal ores in quantities many times greater than all of the metal ores mined by man in all of history. Artificial gravity can be produced by spinning the habitat. Nuclear energy is readily available with little need for concern about radioactive contamination. Disposal of radioactive contaminants are safely accomplished through the simple expedient of deorbiting the material into the Sun.