Benjamin ... again another very good call. I agree with you. By the end of 2100 the world may need giant facilities that effectively purify the atmosphere for the planet. I have to say that it seems unthinkable to attempt something on that scale - but we may not have a choice. Essentially we will be "terraforming" our own planet. We will probably need to make adjustments to the oceans as well.

cheers,
Pete2