Mars is going to be its own unique kind of hell.
I’ll stick to Earth i.e. the hell I’m already familiar with.
living on a shithole planet with half earth gravity where your bone density will be fucked in a few months and you spend trillions to keep a small population alive and mine ice water to survive
isn't the reasoning for the mars colony bros like musk that we need a small backup to eventually repopulate earth in case we annihilate ourselves via nuclear sudoku or get asteroided etc? even if we melt all the ice and continue onward, earth will be a relative paradise compared to the wasteland of mars.
the whole "we need to find another planet" thing because we're making our extremely hospitable planet relatively less hospitable, but still very much livable relative to anything else remotely feasible in our near vicinity is just dumb.
as far as earth ghg's, im no climate skeptic. clearly climate change is going to fuck a lot of people in the near future, but we're quickly getting to the point where carbon capture, and emission reduction policy is positioned to start being somewhat effective. we'll see what sort of timeline or if there will be enough buy in for the required government investment around the world in this future, but the technology is at least plausible, and over the next century CO2 emitting industry will slow down significantly.
youtubers save the world maths:
"in 2017 the world emitted 32.5 gigatons of c02, if this technology were built at a scale to suck all of this out every year at $93 - $232 per tonne x 32.5 gigatons = $3 - $7.5 Trillion annually"
Global gdp is over 80 trillion.
https://carbonengineering.com/https://www.globalccsinstitute.com/news-media/insights/9109/https://www.ipcc.ch/site/assets/uploads/sites/2/2019/02/SR15_Chapter2_Low_Res.pdfStill a big maybe, but even the officials are at least acknowledging there is a possibility of greater technological intervention beyond what is currently theorised to reduce carbon emissions alongside efficiency/low energy and reduction efforts.
IAMs (Integrated assessment models; models of how humans/society affect the natural world) mostly incorporate afforestation and bioenergy
with carbon capture and storage (BECCS) and only in few cases also
include direct air capture with CCS (DACCS) (Chen and Tavoni, 2013;
Marcucci et al., 2017; Strefler et al., 2018b)....
However, there
are a few potentially disruptive technologies that are typically not yet
well covered in IAMs and that have the potential to alter the shape of
mitigation pathways beyond the ranges in the IAM-based literature.
