BBC News, Matt McGrath: Researchers believe we could soon cross a threshold leading to boiling hot temperatures and towering seas in the centuries to come. Even if countries succeed in meeting their CO2 targets, we could still lurch on to this "irreversible pathway". Their study shows it could happen if global temperatures rise by 2C. NOTE: A search of the Internet documents that there have been many very large urban and wildfires throughout history, before the large scale use of fossil fuels.
