On December 28, 1973, President Richard Nixon signed the Endangered Species Act. The landmark law has prevented 99% of animals and plants listed as threatened or endangered under its protection from going extinct, including the bald eagle, humpback whale and Florida manatee. But despite its success as a conservation tool, the ESA is not without its limitations and no longer has the bipartisan level of Congressional support it once enjoyed decades ago. Michelle Nijhuis is a contributing editor at High Country News and the author of “Beloved Beasts: Fighting for Life in an Age of Extinction.” She recently wrote about the ESA for High Country News and joins us to talk about its success, limitations and the important role state agencies also play in wildlife conservation amid a changing climate.