Crazy as it sounds, a group of academics from British universities is making a plan to build a 12 -mile pipe, held up by a huge balloon, that would pump (4) quantities of toxic chemicals, suc

Crazy as it sounds, a group of academics from British universities is making a plan to build a 12 -mile pipe, held up by a huge balloon, that would pump (4) _______ quantities of toxic chemicals, such as sulphur dioxide, into the atmosphere.