White‑nose syndrome (WNS) has killed many bats, but some populations have not yet been affected. Although WNS has not yet impacted all regions where bats live, the disease's likely spread in the face of global warming is cause for concern. Bats are important predators of mosquitoes and other nocturnal insects, and they play an important role in the ecosystem. The continued decline of bat populations could have severe impacts on the environment and the species that share it, including humans. Which example represents an application of the precautionary principle as it relates to the spread of WNS?