Checking the ever useful Duracell MSDS , "Environmental Effects: These batteries pass the U.S. EPA's Toxicity Characteristic Leaching Procedure and therefore, may be disposed of with normal waste". Their lame punctuation, not mine....
Overhere almost every shop that sells batteries will take back the used ones as well. /ubbthreads/images/graemlins/thumbsup.gif You can also save them up and wait for the monthly Household Hazardous Waste Collection.