WORLD HISTORY

Detailed explanation-1: -Southwest Asia’s biggest pollution problems come from human sewage, agricultural runoff, and industrial waste. Rapid growth of industry in cities and towns has caused garbage and sewage to build up in rivers and streams. Towns without proper sewer systems dump untreated human waste directly into rivers.

Detailed explanation-2: -It is currently estimated that in South Asia between 68 to 84 percent of water sources are contaminated.

Detailed explanation-3: -Domestic Pollution Rivers in Asia are highly polluted with domestic waste. Many of the region’s rivers contain up to 3 times the world average of human waste derived bacteria (measured in faecal coliforms, or FC).

Detailed explanation-4: -Groundwater, especially shallow groundwater, in many sites in South Asia is contaminated with dangerously-high levels of arsenic (12). Long-term exposure to the high levels of arsenic in drinking-water reduce child survival (13), and lead to cognitive impairment (14), cardiovascular diseases (15), and cancer (16).

Detailed explanation-5: -Most of Southwest Asia has an arid, or very dry, climate. Deserts cover most of the Arabian Peninsula and large parts of Iran. Temperatures can rise to 129°F (54°C). When rains come, torrents of water race through wadis, or streambeds that are normally dry.