David Heaton from accountancy firm Baker Tilly said it could be a particular problem for mobile families and the changes overall will make the system much morecomplicated.
His work focuses on a simple problem with a single asteroid, but anybody who has played the game knows that there are far morecomplicated setups as well.
He said pollution from old mines and wells was a common problem long before the recent gas drilling boom, which began about five years ago, adding that the situation is morecomplicated than many outsiders realize.