The last major cause of water pollution is failure to clean up human and animal waste. These sources can harbor millions of bacteria and deadly diseases once they reside in the water, eventually spreading to marine life and other organisms (water pollution). Among all the different types of pollution, water pollution is one of the leading causes of death (water pollution). Pollution poses many threats to life on Earth and must become a major global priority. The effects of pollution may not be so obvious at the moment, but within years the problem could surpass our ability to combat this global problem. In ten years, the only home for polar bears and penguins may be the zoo. The rate of deaths each year could also increase dramatically if anti-pollution measures are not put in place. As inhabitants of this world, people must realize the terrible effects of the decisions they make and make a change in their lifestyle to make this world