Strange yellow stickers

I was doing a spot of birthday shopping last night, and went to Hamleys, Debenhams, John Lewis and the Disney Store, all on or near Oxford Street in London. The strange thing was that some of the toys had these strange yellow stickers on them saying that the packaging may contain destroyed rainforest! They weren't on all the toys though, they just seemed to be on the Transformers, the Disney Princesses and the Barbies. Now, I'm sure I've seen something like this on Barbies before, but I was surprised to see them on the Princesses and Transformers now too!