I know right? When’s it scheduled for again?
Climate scientists have long warned that if we continue to burn fossil fuels like coal, oil and natural gas as our dominant source of energy, the planet will warm, extreme events will increase, and we will become more vulnerable to disasters. Overall, the planet has warmed about 1.2°F over the past century. Since I was born in 1970, the United States has heated up at a pace of 0.5°F per decade. As Lemonick points out, ”Scientists know that the increasing load of greenhouse gases we’re pumping into the atmosphere doesn’t “cause” extreme weather. But it does raise the odds, just as a diet of triple bacon cheeseburgers raises the odds of heart disease.”
All weather is now born into an environment that is warmer and moister because of man-made, heat-trapping greenhouse gas pollution. Thanks in part to warmer oceans, there is 4 percent more water vapor in the atmosphere and that amount will continue to increase as the planet warms, providing more fuel for storms. Droughts, wildfires, heat waves and heavy downpours are going to become more frequent, more intense and longer lasting. In fact, we can already see this playing out in historical data.
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As the Intergovernmental Panel on Climate Change concluded in its most recent assessment report: “warming of the climate system is unequivocal, as is now evident from observations of increases in global average air and ocean temperatures, widespread melting of snow and ice, and rising global average sea level.” And as data continue to pile up, the evidence gets ever stronger that human-induced emissions of greenhouse gases are the main cause of the observed warming over the past century.
But hurricanes are difficult. Climate models predict that they will become more intense. At the same time, considerable uncertainty remains. We have only about 40 years of reliable observational records, which precludes a clear determination of their variability. Given that different aspects of climate change could act to increase or decrease hurricane activity, whether or not Katrina can be ascribed to global warming is a challenge beset by difficulty.
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Humanity has done little to address climate change. Global emissions of carbon dioxide reached (another) all-time peak in 2010. The most recent international talks to craft a global treaty to address the problem pushed off major action until 2020. Fortunately, there’s an alternative—curbing the other greenhouse gases.
Specifically, in the case of rapid action to slow catastrophic climate change, the best alternatives appear to be: methane and black carbon (otherwise known as soot). A new economic and scientific analysis published in Science on January 13 of the benefits of cutting these two greenhouse gases finds the benefits to be manifold—from human health to increased agricultural yields.
Even better, by analyzing some 400 potential soot- and methane-emission control measures, the international team of researchers found that just 14 deliver “nearly 90 percent” of the potential benefits. Bonus: the 14 steps also restrain global warming by roughly 0.5 degree Celsius by 2050, according to computer modeling.
