Extraordinary polydactyly

"On 22nd March, 2010, A chinese boy From Shenyang, capital of northeast China’s Liaoning province, showed his weird fingers and toes. He has a total of 31 fingers and toes, 7 fingers in left hand, 8 in right hand and 8 toes in each foot. He has broken the earlier record of 25 fingers and toes. He is currently in Shenjing hospital and ready for an operation."

One can't help but wonder whether occurrences like this reflect merely a small probability event occurring in an immense population, or whether it suggests effects of environmental problems.