请根据下列任务预习课文，并在课堂上按照老师的引导检查各项任务的完成情况。
Task I. Skimming
Read the text (P26 - P27) quickly and fill in the blanks.
The text explains the 1. ________ of the earth’s increasing temperature and puts forward different views about the 2. ________ of increasing carbon dioxide in the atmosphere.
Task II. Careful reading
