The book also explains that nuclear power and clean coal are not clean technologies. Apart from the risks associated with nuclear power, "multibillion-dollar nuclear plants are simply not cost-effective when compared with other energy sources." The authors also believe that "clean coal" is an oxymoron for a myriad of reasons, including the sheer number of coal mine-related deaths and the fact that coal-fired plants, even some cleaner ones, are major contributors to serious illnesses such as asthma, heart disease, and mercury poisoning.