> Cleaning up flying is a mission of improbable scale: Neutralize the carbon emissions of about 25,000 planes in the world’s commercial fleet that typically fer

> Cleaning up flying is a mission of improbable scale: Neutralize the carbon emissions of about 25,000 planes in the world’s commercial fleet that typically ferry some 4 billion people a year Pop quiz: how many people fly each year? Hint: the answer is not 4 Billion. It is more like 800 million