Here's an online petition that you can sign and send to Bud Selig to keep the Astros in the National League.
And the text:
Dear Mr. Selig,
As a lifelong Astros fan I am very upset with your plans to move the Astros to the American League and/or out of the Central Division. The Astros have been in the National League since their beginnings in 1962 as the Colt .45s. Before that the Houston Buffs were a minor league team for the St. Louis Cardinals which is also in the National League. All our rivalries are in the National League.
We are also in the central time zone which is 2 hours ahead of the western time zone. If the Astros were moved to the western time zone a majority of our games would not start until 9pm and would end after midnight. The box score would not even make our newspaper.
You acquired the Seattle Pilots in bankruptcy court, moved them to Milwaukee, and renamed them the Brewers in 1969. The Brewers were in the American League from 1969-1997 (28 years) and then moved to the National League in 1998. Since the Brewers don't have near the years of history in the National League that the Astros have, move the Brewers back to the American League to make the American League more balanced if that is so important.
Please Mr. Selig, leave the Astros alone. You are breaking my heart and ruining what is left of our fanbase.