Of course you could never ever built anything this cool with wooden blocks but Lego has become popular I almost think it might become an issue considering raw oil and producing nondecomposable trash. They should think of offering a recycling model or some sort. Of course you can re-use these blocks over and over again but again people want and buy these new sets like the Roller Coaster Set (which is extremely cool. So maybe recycle some pieces to get new sets in return. What do you think?