Why I think it sinister and worth a mention. (aside from the usual po-faced green stuff): State – Creep from all angles :

http://www.dailymail.co.uk/news/article-485336/Schools-warn-Gore-climate...

Al Gore's film An Inconvenient Truth has been called unfit for schools because it is politically biased and contains serious scientific inaccuracies and 'sentimental mush'.
Schools will have to issue a warning before they show pupils Al Gore's controversial film about global warming, a judge indicated yesterday.

The move follows a High Court action by a father who accused the Government of 'brainwashing' children with propaganda by showing it in the classroom.

Stewart Dimmock said the former U.S. Vice-President's documentary, An Inconvenient Truth, is unfit for schools because it is politically biased and contains serious scientific inaccuracies and 'sentimental mush'.

http://www.timesonline.co.uk/tol/comment/columnists/mick_hume/article420...

No, I won't have children telling me what to eat
Our offspring are becoming the footsoldiers of the re-education crusade
Mick Hume

Once upon a time, not so long ago, parents were supposed to educate children in the ways of the world. But the Government appears to have turned that arrangement on its head. Now it is deemed the job of children to teach parents right from wrong.
Our children are apparently being educated as self-righteous foot soldiers in a crusade to re-educate us in the official doctrine of “Healthy Living, Whether You Like It Or Not”. The innate tendency towards sanctimoniousness and zealotry among youngsters who see things in fairytale black-and-white terms (“five veg a day good, one fag a day bad”) makes them natural narks.
Amid all the talk of liberties and fears of an “Orwellian” state, these trends rarely get a mention. Yet there is a long history of authoritarian regimes using children to do their dirty work. The official “child heroes” of George Orwell's 1984 were members of jolly groups such as The Spies,

>>It was almost normal for people over thirty to be frightened of their own children. And with good reason, for hardly a week passed in which the Times did not carry a paragraph describing how some eavesdropping little sneak — ‘child hero’ was the phrase generally used — had overheard some compromising remark and denounced its parents to the Thought Police.<<

- George Orwell, 1984

I only mean the "green kids" thing is not particularly sinister. They seem to be playing games aimed at decreasing energy consumption, and there isn't (so far) any consequence for turning in uncooperative adults.