Final answer:
David Harte should confirm his findings, then contact environmental agencies like the EPA, communicate with the power plant, seek peer review, and possibly engage with public advocacy groups to address the acid rain harming the tiger salamanders.
Step-by-step explanation:
After David Harte discovered that a power plant was releasing sulfuric acid into the atmosphere, leading to acid rain that is harming the tiger salamanders in the Rocky Mountains, his next steps would likely involve several actions. First, he should collect more data to confirm his findings and rule out other potential causes of harm to the salamanders. Once he has solid evidence, he should contact environmental authorities, such as the Environmental Protection Agency (EPA) or local conservation agencies, to report the issue. Additionally, he may reach out to scientific colleagues for peer review and potential publication of his findings, and he might even need to communicate with the power plant operators to discuss the issue and seek solutions. In cases like this, public awareness and policy advocacy groups might also be valuable allies in addressing the environmental problem.