A new way to make steel could cut 5% of CO2 emissions at a stroke
One thing that human space exploration/settlement teaches us more than anything is how to do everything without net carbon emissions. Solar power? Nuclear power? Both essential to and pioneered in part by space exploration. Same for fuel cell tech. On the International Space Station, CO2 is sucked from the cabin air, combined with hydrogen (produced as a byproduct of producing oxygen by splitting water, much of which was recycled from the air and waste water and urine) to make methane and more water.ISS also is getting a plastic recycling machine that will be used to 3D print replacement parts from plastic waste and old parts.Human spaceflight is like the Sustainability Olympics.