Global warming is truereal.

"True" isn't wrong, but it sounds a bit unnatural.

When I was in elementary school, my school was behind my village, and it was so close to mythe village, but between the school and mythe village, there was a river.

In this case, you can replace the "my" with "the", as we have already established it is your school and village. In Chinese, you would not always say 我的学校 or 我的村，once the subject has been established you can drop the "我的" and just say 学校. It is the same here, but you must use "the".

The river wasent around mythe village, and there was only one entrance to the south of mythe village.

Generally, we went to school this way: went out of the village entrance, and along with the river to go to school, but when winter came, the river was all frozen, so we went straight across the river to go to school.

It iwas the shortest way to go to school: the distance was only a river's width.

But now, the river has dried up many years ago, and the school doesn't exist either.

It can be seenis obvious from this point that the weather is getting warmer and warmer.