It's called "Bedtime Stories" and features a father reading a story to his little girl where not being environmentally friendly will mean puppies drown - oh yes
Whatever your view on climate change, the advert illustrates the weakness of the argument by the Government when it has to resort to emotional appeals that scare children.
There's also a petition about this on the Downing Street website although I doubt it will result in the Government pulling the advert. It's much easier to frighten people into action with an advert. It worked for George Bush against John Kerry in 2004 after all.