Turning CO2 Into Food April 11, 2017 Are you marching for science a week from Saturday? Click here! (“Atmospheric CO2 concentrations are now on pace to double this century, reaching the highest levels in 50 million years. Without further action, we’re headed to a point of no return for the planet.”) But here for 11 minutes of good news: If astronauts on a little spaceship to Mars can recycle the CO2 they exhale into food they consume — with the help of some microbes whose name I can’t pronounce — what if the soon-to-be 10 billion astronauts aboard our little spaceship Earth could do the same thing? Taking carbon dioxide out of the air and turning it into food?