700m or so extra people may move to cities by mid-century and may double or triple demand for health services, transport, energy, housing, sanitation, food and water.
Global wind power capacity increased by 31% in 2009, contributing 2% to global electricity consumption.
A global shift towards a vegan diet may be vital to save the world from hunger, fuel poverty and the worst impacts of climate change, says a UN committee.
Over 850m people are at risk due to the current food crisis. Rising fuel costs, erratic weather, and the conversion of land to grow crops for biofuels are all factors.
75 nations have jointly launched the world's first multinational organisation dedicated solely to promoting renewable energy worldwide.