Well over here they banned lead shot for all waterfowl (or shooting over water) and the impact of leadshot accumulation on land has certainly been examined with a view to a ban by the powers that be.

I believe that much of the science used to support the original ban for waterfowl has since been refuted, but just like the ban on handguns, when they found out that gun crime is still rising despite a handgun ban, they didn´t allow us to have them back again. Can you believe that the British Olympic teams had to travel abroad for practice in the past?! Now I think they are getting special dispensation for 2012 in London (I think it is only .22 now anyway...)

We also have a velocity limit on military shooting ranges (i.e. just about every official range in the country). I can´t quote the numbers off the top of my head, but it is not particularly fast. I believe there is an energy limit too, which creates problems for some big NE cartridges. I will look up the numbers and post later.