The only viable solution for the environment is not space travel like Elon Musk would argue, it's not electric cars, it's not CO2 sequestration https://www.sciencealert.com/scientists-create-a-material-th... since like this article shows, there are so many diverse pollutants, the solution is that people reduce their consumption drastically.

For example, stopping with all the unnecessary things like cosmetic products, eat much less https://www.theguardian.com/environment/2007/jul/19/climatec..., use non-polluant transports, reuse, repair all the things, and so many more things that have big impact on one's environmental footprint. If people reduce by 2 their environmental footprint, it's virtually cutting by a half the world population, and the world production that just serves consumption

I've been living the "minimalist"/non-consumerist and happy lifestyle since I'm a student, I'm likely polluting less than 10% of the average adult in my country (France), at this rate out planet would sustain 10 billion people without our current environmental damages

Less pollution? Renewable powered electric vehicles would be a step forward.