Mutation (My story)

This topic has nothing related about my assignment.
I just figured it out and got interested about this topic right after I saw the 8tv news at 12.30pm.
I saw the news is about building a factory at a town and most of the villagers don't agree about it.
Obviously factory are build because of human needs and greediness, but we don't want factory to build because it will effect our health. Since we only got one life.

While eating and watching the following news, I was thinking that if human can mutate according to the environment isn't that will be great?
If I not mistaken, in the ancient time human used to have a lot of hair compare to now a days. Because during that time, the weather are colder. As the weather gets hotter, our hairs tend to drop and changes. Same goes to the animal/insects.

This is a possibility that human have gone through the mutation.
Might our next generation we are forever like us now ?
What happen if it goes further ?

Base on the questions about "Might our next generation we are forever like us now ?
What happen if it goes further ?" I thought of many ridicules stuff .

If a scientist, took DNA animal/insects. Ermm... For example lizard and crow. Because lizard can change body temperature according to the weather and crow can accept the dirty environment surrounding. Of course, just extract the good DNA. Hahaha... if not I wonder the bad DNA might change our looks too. After extracting the DNA and inject to our body. If this really happen and no side effect, "wow" this will be really really great. This will allow us live longer and have less sickness. Then the government no need to worry about building the factory. But still we must concern about our be lovely earth. You don't want it to be destroy, if not we will die too. 

If and only if it will happen, it can safe hundreds and hundreds of life. Looking at those kids, elderly or cancers patient that need helps. I know and might not happen because is against the GOD laws.