Reforestation, and a limitation to asphalt/concrete that replaces grass, would also take up CO2. I read somewhere that an acre of grass takes up over a ton and

Reforestation, and a limitation to asphalt/concrete that replaces grass, would also take up CO2. I read somewhere that an acre of grass takes up over a ton and a half of CO2 per year. That's a lot. If we could revert a million acres a year to grasslands, we'd eventually put the Earth back on an even keel. There's also the algae in the ocean which generate a significant amount of the world's oxygen -- reduce pollution of the oceans and maintain a healthy food chain, and perhaps this will restore itself as well. The Amazon rain forest alone is responsible for a huge chunk of CO2-to-O2 work, and they're chopping it down at an alarming rate. Stop destroying the rain forest and restore as much of it as possible. I think these policies would be far more effective long term than this hokey air-to-fuel thing, and without needing to crack water for the H2 that the plan requires. That said, it sounds like cool technology and if it became competitive with fossil fuels, using (I suppose) solar energy to obtain the H2, it's a brilliant idea.