Read the following sentences that appear within a research paper on global warming. Global warming, otherwise known as a gradual climate change, is a subject that has been in the spotlight more and more recently. My dad reads about global warming frequently; in fact, he was just reading about it this morning at the breakfast table. The effects of global warming are far-reaching and catastrophic, affecting everything that lives within nature, from our oceans to our forests to the temperature of our air.

In terms of content, what weakness needs to be addressed in the paragraph?

It contains facts that need to be cited.
It does not effectively convey the topic of global warming; the topic is unclear.
It contains unrelated information.
It is correct as written.