Topic is : Invasive zebra mussels in the Great Lakers region.The proposalIdentify a proposed topic. Describe your topic in a paragraph or two, and, as part of that description, briefly explain why the topic is relevant to a course in environmental economics.Briefly discuss the central environmental economic theory of your topic. You should have a clear theoretical perspective that frames your analysis. Ancillary background material is not necessary at this stage. Citation of data source and major references is required. This proposal should be no more than 2 pages in length.