NGSA states that one tower is half as noisy as a gas lawn mower. The information in the first site may be verified by checking with the California electric utilities to determine how much electricity they have generated using wind. This suggests that the numbers presented are reliable. The information in the second site also appears to be quite reliable. The fraction of the time the wind blows is consistent with my personal experience.
Birds being killed by the windmills certainly seems possible.
The only questionable statement is about noise pollution. This is likely to depend upon the design of the windmill and possibly even its tower. None of these problems outweigh the fact that wind energy will not run out and does not pollute. Presently, it may not be cost effective, but eventually our supply of fossil fuels will be depleted and costs will rise. The other missing piece of the argument is that the cost of electricity generated by fossil fuels does not yet include the cost of the environmental damage it causes.