Global warming & the green house effect?

Question

hw help plz.

1. list 3 uncertainties about global warming.

2. help me find 1 article with facts that supports global warming & 1 article that doesnt based on facts.

thanku.

Answer 1

Three uncertainties.

How is it happening?

How fast is it happening?

What can we do to stop it?

Answer 2

http://topics.nytimes.com/top/news/scien...