> around 10B tonnes of C every year For comparison world uses around 97 000 000 barrels of oil per day, or about 3.5 billion tonnes of oil per year. Switching

> around 10B tonnes of C every year For comparison world uses around 97 000 000 barrels of oil per day, or about 3.5 billion tonnes of oil per year. Switching to synthetic oil (or any other hydrocarbon - I think methane is the easiest) would make a significant difference (and would make renewables much more viable, by solving the energy storage problem).