recycling bins for cans, bottles, paper, etc
Absolutely.
compact fluorescent light bulbs
motion sensors on dressing room and office lights so that they are only on when in use
dimmers on dressing room and office lights so you can only use the amount of light you need
Hmm - I dislike CFL's - they do have quite a large environmental impact when they are not disposed of properly (they contain Hg). Whilst their overall carbon footprint is lower when used correctly, a lot of places do not properly recycle CFLs (and standard Florries). Dimmers for lights are generally quite wasteful, instead, if you do not need that brightness all the time, downgrade the wattage of the bulb you use - use 40 instead of 60, 60 instead of 100. If you are doing a new installation, more circuits is better, so that you can only turn on lights that you need to use.
unplug anything that can be unplugged when not in use (or turn off at power switch)
donate/ recycle old sets/ costumes/ props
switch to environmentally friendly cleaning products
switch to environmentally friendly paper products
Absolutely - if you don't want to pay inflated prices - look for the products that say "Safe for septic tanks" or something along those lines - they are biodegradable and do not kill the good bacteria that is natures natural garbage disposal system.
buy a bunch of coffee mugs for your coffee station instead of paper or styrofoam cups
Even better - everyone brings their own mug.
The biggest carbon footprint in most of the event industry is transport. Try and talk to the cast about setting up a car pool system if everyone drives, encourage the use of public transport by including train and bus routes that pass near to the venues in your welcome packets, if you are involved in the rehearsal room choosing process, look for proximity to public transport and to shops for lunch etc (so people wont want to drive down to McDonalds etc for lunch).
The other one is to calculate how much it would cost to offset your carbon footprint using carbon credits, and to try and convince the guys with the cash to put a % of each ticket sale aside for that (if they qualify they could put something like
on the promos and tickets, and it may be a great publicity thing)