Iowa View: It’s time for Iowa to lead on climate change
Written by GREGORY CARMICHAEL AND EUGENE TAKLE
Iowa seems to have become a state of extremes.
Last year, record early warmth prompted fruit blossoming in March and corn planting in early April, only to be severely challenged by late freezes and widespread drought. This year, a cold start to the planting season, followed by the wettest spring on record, has delayed planting and produced widespread soil erosion from extreme rainfall.
Last year along the Mississippi River, low water brought barge traffic to a standstill. This year, barges were halted when locks near St. Louis were overwhelmed by rising waters. In recent weeks, both central and eastern Iowa have had major flooding, which might have rivaled previous records if these patterns had persisted one more day.
While a recent arrival to our state might wonder if extreme weather is the norm and a longtime Iowan might question whether a new normal has arrived, all of us are likely asking, “What’s going to happen next?”
Unfortunately, climate science cannot tell us for sure what the next season or year will bring. It can, however, help us understand which way our future weather is trending. Using a mixture of modeling, historic records and field studies, climate scientists investigate how changes to atmospheric processes can affect long-term trends in our state.
These tools, along with years of extensive study, have shown us that heat-trapping gases like carbon dioxide and methane and black carbon resulting from combustion of fossil fuels are relentlessly shifting our future toward more extreme events.
Though weather events and climate change are not always related, we know that the last few decades have brought shifts in weather patterns. What we once considered 500-year floods are now occurring much more frequently than expected. Extreme high temperatures are now, by conservative estimates, twice as likely to occur as extreme lows.
Iowa has experienced, first-hand, billion dollar losses due to extreme precipitation and drought. Unfortunately, these events are becoming much more commonplace. While some of these shifts have been caused by natural variations within the Earth’s climate system, we know that human activity is now a leading driver in creating more disruptive weather and climate.
Fortunately, Iowa is in a strong position to be a leader in reducing climate change losses and growing a more sustainable economy.
As one of the nation’s largest producers of wind power, we should ask our federal leaders to establish stronger policies promoting renewable energy. As a center of innovation, we can continue to develop effective flood control approaches that protect our communities, reduce runoff and improve water quality. Finally, as one of the largest agriculture-based economies in our country, we can push the envelope on developing drought-resistant crops and more sustainable land-management practices that protect our soil as well as the health of our waterways.
Though Iowa’s extremes have brought very real and sometimes painful losses to many communities and farms around our state, our suffering need not have been in vain. No matter what tomorrow’s weather brings, our state can become a model of sustainability and energy efficiency so that “as Iowa goes, so goes the nation.”
GREGORY CARMICHAEL is a professor of chemical and biochemical engineering and co-director of the Center for Global and Regional Environmental Research at the University of Iowa. EUGENE TAKLE is director of the climate science program and a professor of atmospheric science and agricultural meteorology at Iowa State University.
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