> So, we're well into geo-engineering territory now, What is geoengineering? This is a local measure, little different from erecting a huge sunshade (and very

> So, we're well into geo-engineering territory now, What is geoengineering? This is a local measure, little different from erecting a huge sunshade (and very different from blocking the sun from the stratosphere or orbit). I consider geo engineering to be action at a planetary level, like the above mentioned stratospheric dreams or driving lots of automobiles. Something local, that can be switched on and off almost instantaneously, to be quite different. Are he big machines that suck the atmosphere through a straw geoengineering?