He combined bird population and species maps with the locations and construction dates of all wind turbines in the United States, with the exceptions of Alaska and Hawaii, between 2000 and 2020.

他将2000年至2020年期间，除阿拉斯加和夏威夷外，美国所有风力涡轮机的位置和建造日期与鸟类种群和物种地图相结合。