The atmosphere has been our prime waste repository, because discharging exhaust up through smokestacks, tailpipes and chimneys is the simplest and least (immediately) costly thing to do.

• 大气会成为我们主要的废气储存槽，是因为透过烟管、排气管与烟囱排放废气，做起来最简单，直觉上也最省钱。