The Day After Tomorrow

I'll introduce one of my favorite movies!

It's "The Day After Tomorrow".

This story is about global warming.

Today global warming is getting worse, so if
we don't think about the problem, the earth will
be such as this movie.

I learned the global warming threat from this movie.

By the way, I don't know how to use articles "a" and "the".

Please teach me if you can.