The author's main purpose in writing the article is to warn of ______.

A．The earth will get extremely hot.
B．The balance between the amount of heat absorbed from the Sun and the amount lost could hardly be maintained.
C．The light of the Sun could no longer reach the surface of the Earth.
D．Infrared radiation could no longer be transmitted from the Earth to outer space.

A．To change your stocks into cash at once.
B．To spend outside as little as possible
C．To cut down the fees for consultation.
D．To save receipts for less tax payment.