Why is wind power better than fossil fuels?

Because it is a renewable energy source. This means that it will never run out like fossil fuels. It is also clean to use - there's no pollution.

In most cases, it is not better. Wind produces very little effective power. Wind systems require fossil fuel backup systems and kill many birds and bats annually.

They can be effective though. In eco-villages most houses are often powered by a combination of solar cells and wind turbines. Believe it or not they aren't as harmful to the environment as you might think at first, however they can be quite loud when in close proximity to your house.