Tuesday, May 26, 2015

Climate Change: A Nobel Laureate Emphasizes the Big Picture

Mario Molina says even if we can't predict exactly how bad global warming will get, it would behoove us to do something about it.

Climate Change: A Nobel Laureate Emphasizes the Big Picture

In his plenary talk at the American Chemical Society last week, Nobel winner Mari Molina painted a picture of our atmosphere as wafer thin – like the skin of an apple. So it shouldn’t be too surprising, he said, that our activities have changed its composition. Molina shared the Nobel Prize for his work connecting refrigerants, spray can propellants and other pollutants to the depletion of atmospheric ozone and the ozone hole. 


Now he’s turned his attention to climate change. Molina pointed out that CO2 is a trace gas, but it has a profound effect. Its absence would turn our planet into an iceball, with global average temperatures falling from about 60 degrees F to less than 0 F.
Now, fossil fuel burning and deforestation have nearly doubled Earth’s atmospheric CO2 from before the industrial revolution.  Earth has seen high levels like this in earlier eras during periods of extreme heat. 

“We’re not breaking any paradigms here,” he told the audience. “We’re using very basic science.” But the atmosphere is a complex system and we can’t predict exactly what’s going to happen. To illustrate the point, he showed a drawing of two roulette wheels, each one showing a different range of temperature increases. One represented a future with business and usual and showed a higher range of possibilities. The other wheel represented a future in which we curtail global fossil fuel burning and it displayed a more moderate range of possibilities. Either way we have to play roulette, he said, but which wheel would you rather spin?

He also made the point that scientists and journalists may be misleading the public by claiming that individual hurricanes or fires or disease outbreaks are caused by global warming. Such statements are answers to the wrong question. “It’s not whether any given event was caused by climate change but whether such events are increasing in intensity,” he said. There were always floods and fires and heat spells and outbreaks of disease. To see what’s changing you have to take a big picture view. 

Several stories and blog posts this week tried to tie global warming to the news of an increased death rate from West Nile Virus. Following Molina’s advice, the right question is not whether fossil fuel burning caused people to die from West Nile, but how heat spells and associated disease outbreaks are intensifying as climate change proceeds and parts of the world heat up. 

About this blog
Faye Flam - writer
In pursuit of her stories, writer Faye Flam has weathered storms in Greenland, gotten frost nip at the South Pole, and floated weightless aboard NASA’s zero-g plane. She has a degree in geophysics from the California Institute of Technology and started her writing career with the Economist. She later took on the particle physics and cosmology beat at Science Magazine before coming to the Inquirer in 1995. Her previous science column, “Carnal Knowledge,” ran from 2005 to 2008. Her new column and blog, Planet of the Apes, explores the topic of evolution and runs here and in the Inquirer’s health section each Monday. Email Faye at fflam@phillynews.com. Reach Planet of the at fflam@phillynews.com.

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