My paper on housing construction and the Endangered Species Act, The Costs of Environmental Land Use Regulation, has just been published in the Journal of Public Economics. The central idea of the paper is that the Endangered Species Act creates hundreds of natural experiments testing the effect of environmental land use regulation. This same effect shows up in reverse after de-listings: places in endangered habitat increase their permits relative to similar places outside of the habitat after an animal is removed from the endangered species list. There have been hundreds of new additions to the endangered species list since 1980 and endangered species habitats now cover the vast majority of the country. The End of the Endangered Species Act?