“Uncomfortable humidity, water‐logged spring soils, extreme rain events, mold, and mosquitoes are all expected to become more prevalent in Iowa due to a rarely discussed impact of climate change: increased humidity,” 190 scientists at academic institutions warned last week. In the sixth annual Iowa Climate Statement, science faculty and researchers from 39 colleges and universities noted that “Increases in humidity have been measured across the Midwest and in Iowa across all seasons and at all long‐term monitoring stations.”
High levels of humidity create hazardous conditions for Iowa workers and sensitive populations through the danger of heat exhaustion and heatstroke. Allergic rhinitis and asthma are worsened by heightened exposures to mold and dust mite allergens in humid environments. There also is evidence for increased aggression and societal violence associated with hot, humid weather.
For Iowa agriculture, increased warm‐season humidity leads to increased rainfall, extreme rain events, water‐logged soils during planting season, soil erosion, and runoff of chemicals to waterways. Rising humidity also leads to longer dew periods and higher moisture conditions that elevate costs of drying grain and increase populations of many pests and pathogens harmful to both growing plants and stored grain. Increased nighttime temperatures coupled with humidity causes stress to crops, livestock and pets and, in extreme cases, heat stress can cause loss of life.
I enclose below the full text of this year’s Iowa Climate Statement, with references, along with the news release highlighting key findings. You can view the names and academic affiliations all who signed here.
P.S.-The Center for Global & Regional Environmental Research at the University of Iowa, which has coordinated the release of the Climate Impact Statement, is set to lose much of its funding in 2022. This spring, Republican legislators approved and Governor Terry Branstad signed into law a bill eliminating a small tax on investor-owned utilities, which has supported the CGRER and the Iowa Energy Center at Iowa State University for 25 years.