Monday, September 3, 2007

Ever heard of ox-dung?

I got my son to read aloud a well-written article about global warming, in a children's newspaper. There was mention of transportation then and now - bicycles vs bikes, bullock carts vs automobiles. I explained pollution that results from engines, and was going to mention methane emissions, when he let us know about causes of pollution as he understood it... "yes, bullock carts also pollute...with cow-dung...no, no...ox-dung"