Comprehension Passage

The mainland of India , endowed with a long coastline of 5,700 km will not escape the wrath of the seas. Total length of the India coastline is about 7500 km (all the island territories of Andaman and Nicobar, and Lakshadweep are taken into account). Approximately 81,000 square km of land fall under LECZ in India, housing a population of over 60 million. 50% of this population is in urban regions comprising approximately 31 million people. Projected sea-level rise along the Indian coast will be between 30 and 80cm over the next century. In the absence of any preventive measures, the people living in coastal areas are potentially going to be affected .Climate change is expected to increase environment-related diseases. Warmer and/or wetter period of breeding due to global warming will provide ideal conditions for expansion of mosquito-borne diseases as puddles, in which malaria carrying mosquitoes breed, are created either by excessive rainfall or by droughts in rivers. Lack of sanitation and potable water will increase contaminated water and food-borne diseases like cholera, typhoid, diarrhea, hepatitis, and gastroenteritis. Warmer cities will also induce an increase in respiratory diseases due to pollution whose effects are reinforced by higher temperatures. Changes in temperature and precipitation can spread disease in previously unaffected areas and encourage it in areas already affected.

What is the classical reference period used by the World Meteorological Organization (WMO) to define climate?

1
10 years
2
20 years
3
30 years
4
40 years

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