None of this is a problem. Earth can easily support 1000x more people, and that should be our goal. We are the only intelligent species in this part of the universe, and we are the only species which can protect other lifeforms and take them to other planets. We should multiply and spread life throughout the galaxy.

Biocapacity can be increased with technology and sustainable energy. Our impact on environment can be eliminated with technology and sustainable energy. These are not a problem at all; we just need to utilize more energy.