pIn The World This Week: the highs and lows of the Rosetta space probe's historic mission to land on a comet, the world's worst polluters sign a surprise climate change deal on the sidelines of Beijing's APEC summit, the first Frenchman is sent to jail for joining the Islamic State organisation in Syria, the host of next January's African Nations Cup is announced, and arrests are made in India in the wake of a mass sterilisation that killed over a dozen women.