Higher levels of carbon dioxide may have led, over the past century, to approximately a
A) 1 degree (F) warming of the earth.
B) 10 degree (F) warming of the earth.
C) 1 degree (F) cooling of the earth.
D) 10 degree (F) cooling of the earth.

Question

Quizplus · Accepted Answer

Over the past century, increased levels of carbon dioxide and other greenhouse gases have contributed to approximately a 1 degree Fahrenheit increase in the Earth's average temperature.

Higher Levels of Carbon Dioxide May Have Led, Over the Past