The desire to prevent flooding is understandable, as floods are among the deadliest of natural disasters for humans. Between 1900 and 2004, an estimated 6.8 million people were killed by flood events. About 98 percent of these deaths occurred in Asia.
Floods affect human health and safety in several different ways. A rapid rise of water, from events such as flash flooding or a tsunami, can cause immediate death from drowning or injury. As floodwaters recede, injuries are joined by a greater risk of disease from contamination of drinking water tainted by raw sewage or pollutants. Cholera and other diarrheal diseases are common in the days and weeks after floods. Standing floodwaters can become breeding grounds for vector-borne diseases like malaria; displaced rodent and reptile populations can also cause illness and injury. Critical infrastructure such as hospitals, municipal water, sanitation, and food distribution systems are often destroyed in major flood events, leaving the displaced population at even greater risk.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.