India may lose one of its crucial lifelines - the south west monsoon, which brings rains across the country during the summers, in the next 150 years, warns a new study by Indian Institute of Tropical Meteorology.

The phenomenon is the result of global warming which has led to increase in the rate of temperature rise over Arabian Sea, researchers say. This rise is reducing temperature difference between land and sea, known as Temperature Gradient (TG), responsible for attracting rain causing winds from Arabian Sea towards Indian mainland.