Worst Climate Threat You Never Heard of Is Stronger Than CO2

Bloomberg, By Alex Nussbaum, October 29

The biggest global warming battle you’ve never heard of kicks off in Dubai this weekend.

Climate negotiators from across the globe will gather in the Persian Gulf city to debate how to get rid of hydrofluorocarbons — a class of hundreds of artificial chemicals used in refrigerators, air-conditioners, fire suppressants and other widely used products. While less common than greenhouse gases like carbon dioxide or methane, HFCs can be thousands of times more potent, pound for pound, at heating up the planet.

They’re also gaining in popularity as demand for air conditioning, refrigeration and other services is expected to soar in developing countries in coming decades. The result: HFCs are now the world’s fastest growing greenhouse gases and projected to rise even more in the future.

A worldwide agreement coming out of the United Nations-run meeting in Dubai to quickly get rid of HFCs may keep the equivalent of 100 billion tons of CO2 out of the atmosphere by 2050 and avoid a half-degree Celsius of warming by century’s end, proponents say. That’s about a quarter of the 2-degrees Celsius (3.6-degree Fahrenheit) limit that scientists say is needed to avoid the worst effects of climate change.

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