Jawaban:

Professors, scientists and fellow academia are currently studying the prevention of the trouble we've been experiencing for the past decade: global warming. They searched for alternative ways of producing electricity and other important life utilities without extracting too much dangerous waste. A group of scientists believed that nanotechnology may well be the answer to this problem. Nanotechnology is a concept of making products concerning all details up to an atomic level, so much so that the product's efficiency is maximised. However, the real answer to the underlying problem is still up for debate.

(Tidak Copas, paragraf buatanku sendiri)

Topic: Global Warming Prevention

Main Idea: Ways to prevent global warming from taking further effect

Topic Sentence: Professors, scientists and fellow academia are currently studying the prevention of the trouble we've been experiencing for the past decade: global warming.

I hope this helps :)