A small study in Norway showed that painting one blade of a wind turbine black reduced bird mortality by over 70%.
Wind energy is one of the world’s most popular renewables. It’s also one of the most promising—some calculations suggest that strategically placed wind turbines could conceivably power the entire planet. As more turbines go up worldwide, they’ll help us reduce pollution, water use and carbon emissions, along with the environmental degradation, habitat loss and human health risks that come with fracking and oil extraction.
But there are some who don’t benefit quite as much: flying animals. Each year, turbine blades kill hundreds of thousands of birds and bats. As wind power becomes more prevalent, this number may rise into the millions—although it’s important to remember that other power generation methods likely kill far more birds than wind farms do.
This concern has led to a number of proposed interventions, from turning off wind farms during migrations to installing special whistles only bats can hear. A new study presents a relatively low-cost, set-it-and-forget-it option: just paint one of the turbine blades black.