"Pardon me for letting that dirty word out of my mouth!" T.R. answered. He glanced awkwardly at Daia (who had been a media personality) and then at the rest of the guests, who had fallen silent when one of T.R.’s aides had rolled in a stand supporting a pair of glass bell jars. Beneath one was a heap of powdered sulfur—a miniature version of the huge pile they’d seen earlier. Beneath the other was a mound of powder the same size, but black as black could be. "Two elements," T.R. said, "alike in dignity! The yellow one needs no introduction. You’ll have guessed that the black one is carbon. Both alter the climate. Carbon makes it get warmer by trapping the sun’s rays. Sulfur cools it by bouncing them back into space."