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Letting your car idle isn't actively bad for the drive train, but it certainly does put strain on the engine, additionally engaging the AC will put the engine under load, and work the engine harder even though you're not driving anywhere.
Some numbers cited by various no-idle campaigns estimate that 10 minutes of idling uses about 0.1 gallon of fuel (for a small car). If you idle 10 minutes a day, it adds up to more than 35 gallons a year. And it only takes 10-15 seconds worth of fuel to restart the car. You can save real money just by shutting off the engine on rail-road crossings, at drive-throughs, on long street lights (not recommended for average person) etc.