What Is the Carbon Limit? That Depends Who You Ask by Fred Pearce: Yale Environment 360.
How much carbon can we safely emit into the atmosphere without the planet suffering dangerous climate change? It would be good to know. The world’s governments have agreed that “dangerous” should mean any warming above two degrees Celsius. And in recent reports, the Intergovernmental Panel on Climate Change (IPCC) has tried to translate that into a future carbon budget.
But too many different numbers are still floating around. We could have more than 500 billion tons of carbon that we could safely emit, or the real figure might be close to 100 billion tons — it depends on whose estimates you decide to accept.
The carbon budget looks to be one of the most critical single metrics for keeping planet Earth a safe place to live through the coming century. So it would be a good idea to get to the bottom of the discrepancies, especially since the countdown to dangerous climate change may be shorter than the lifetime of a new coal-fired power plant.
Here is an attempt to cut through the statistical fog.
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