Area of Sunderbans in ganga delta is decreasing. Students will collect data regarding area of Sunderbans and number of Bengal tigers during last 12 years and try to find out :
• Range of area between 1st year and 12th year
• Area of Sunderbans in 12th year to the total area of Indian territory
• Average area allotted to a tiger in Sunderbans in 11th
• Draw a line graph between area change and year of Sunderbans
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EXPLANATION:- 1. The Sundarbans have a combined land and water area of around 3,860 square miles (10,000 square km), with about three-fifths of that area located in Bangladesh.
2. Sundarbans, in southern Bangladesh and northeastern India, were named a UNESCO World Heritage site in 1997.
3. The two main causes of the permanent loss of land to water in the Sundarbans, according to researchers, are increased wave action brought on by storminess (natural) and a reduction in sediments brought on by upstream dams (human-induced).
4. According to a recent study, the ecologically vulnerable region of India and Bangladesh's Sundarbans has lost 24.55 percent of its mangroves (136.77 square km) due to erosion over the past three decades. This news comes as officials assess the harm cyclone Amphan caused to the mangroves there.
5. Mangrove forests are threatened by unchecked coastal development, the disappearance of deltas, and extreme weather related to climate change. Mangrove forests serve as nature's disaster buffer. Mangroves' declining health impairs their capacity for resilience and recovery against the effects of climate change, such as sea-level rise.
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