Pollution is the introduction of contaminants into the environment that causes harm. There are several types of pollution including air, water, soil, and noise pollution. An international non-profit organization founded in 1999 works to eliminate life-threatening pollution in developing countries through various projects. The types of pollution can cause various health issues - air pollution is linked to respiratory and heart diseases while water pollution can cause vomiting, diarrhea, and cancer. Soil pollution from industry, agriculture, and waste can be carcinogenic and cause developmental issues. Noise pollution from transportation and construction can disturb sleep and cause health problems.