If we are shutting down the cruise industry, may as well shut down the power plants as well. Power plants are currently the dominant emitters of mercury (50 percent), sulfur dioxide (60 percent), acid gases (over 75 percent) and arsenic (62 percent) in the United States. They are also a significant source of emissions of greenhouse gases (34 percent) and nitrogen oxides (13 percent). Most of these emissions come from coal- and oil-fired power plants. All of your focus on a small segment in a large industry is narrow sighted.