allAfrica: What last month's march did, better than any other event in history, was demonstrate the unity of activists demanding genuine emissions cuts and government funding of an alternative way of arranging society. They offered a transformative view of a world economy that must go post-carbon and post-profit if our species and countless others are to survive. The world's largest-ever march against climate change last month brought 400,000 people to the streets of New York, starting a lively parade at Central...