Always depressing to see the level of scientific illiteracy in the mainstream media and in many cooperation.
So Fox News, CBS, The Weather Channel and USA today all had articles on ‘aircarbon’ which purports to pull carbon out of the air through a hose.
They generally try to be as vague as possible, but claim they are making carbon out of the air, and that this will be cheaper than regular plastic.
Thats Bullshit on every level:
Firstly if they are making a polymer out of carbon dioxide, you need to put a load of energy into it. More than you would have gotten from burning the oil and creating that carbon dioxide in the first place.
If they are talking about pulling methane out of the air, they are so full of bull it beggars belief. Methane in the air runs at about one part per million. Just pumping enough air to do this would cost more energy than just making a polymer out of oil.
Thirdly, if they are talking about making this polymer from biogas/ biomethane.. then all their claims about making it out of the air are outrageously misleading!
Some ball park figures:
1kg of oil makes ~ 1kg of plastic.
Methane is about 1 part in a million in air. So to make 1kg of plastic requires 1 million kg of air (1000 tons). Air is about 1kg per cubic meter so to extract 1kg of ‘air plastic’ from the air would take about 1million cubic meters of air. About the volume of the empire state building!!