问题详情

Although the fuel consumption is greater in the northern hemisphere, temperatures there seem to be falling. This is ______.
A．mainly because the levels of carbon dioxide are rising
B．possibly because the ice caps in the poles are melting
C．exclusively due to the effect of the internal of the earth"s climate
D．partly due to variations in the output of solar energy请帮忙给出正确答案和分析，谢谢！