Methods that involved splitting CO2 will always be power intensive due to physics. What many people forget is that the martian atmosphere has massive total amo

Methods that involved splitting CO2 will always be power intensive due to physics. What many people forget is that the martian atmosphere has massive total amounts of gaseous oxygen, even if it makes just 0.16% of a very thin atmosphere, if you could capture it and store it would be more than enough for centuries of human colonization. NASA is investigating this very scenario with some low energy adsorption methods, that promise to be very energy efficient: https://www.reddit.com/r/spacex/comments/vhnuqa/nasa_funding_potential_game_changing_technology/ https://www.reddit.com/r/spacex/comments/vhnuqa/nasa_funding... This could enable, for example, the creation of suits that extract unlimited oxygen from the surrounding atmosphere as long as they have electric power - say a few solar panels.