there was a row biggio engineer off the coast of canada who did an experiment to draw down the carbon from the atmosphere by giving the odierno seeding in the ocean and so far it doesn't seem that it's worked out. the idea is to put on here and in the ocean and it attracts the microbes that like to eat iron. and then when they die hopefully they sink to the bottom of the ocean and take it with them. the problem is they don't tend to think all the way to the bottom of the ocean so you end up with more so that is just a start though. and giglio engineering is really in its infancy. if we want to look beyond the biological cities and the jeal engineering. for one thing we have this habit of running into giant rocks and space. gravity brings us into contact sometimes. and we also have a plan that that is full of magma and volcanoes happen sometimes for a really long time and sometimes catastrophically. if we want again to half a million years and hopefully beyond, we need to be thinking about how to get off the planet. we need to be thinking about how humans can have backup cities and new