Analyzing Rhetorical Purpose in Arguments

In a recent article discussing renewable energy, the author argues that investing in wind power is essential for reducing greenhouse gas emissions, stating that it is a cleaner and more sustainable alternative to fossil fuels. The author supports this claim by citing a study from a leading environmental organization that found wind energy produces 90% less carbon dioxide than coal-fired plants. However, some critics argue that wind power comes with its own set of challenges, such as high initial costs and dependence on weather conditions for energy generation. In light of this discussion, what is the author's primary purpose in presenting both sides of the argument?