In government you carry each hope; each disillusion. And in politics it's always about the next challenge.

Climate change is probably the greatest long-term challenge facing the human race

A challenge so far-reaching in its impact and irreversible in its destructive power, that it alters radically human existence... There is no doubt that the time to act is now.

Climate change is the world's greatest environmental challenge. It is now plain that the emission of greenhouse gases, associated with industrialization and economic growth...is causing global warming at a rate that is unsustainable.