published - January 2015 .......
The recent study shows that over the last 40 years, there is a sharp rise in hot waves in the world’s cities and towns.
+ cold snaps have become more infrequent.
This research is based on the examined data from 217 urban areas worldwide.
Such prolonged periods of high temperature had increased significantly between 1973 and 2012. The largest number of heat waves had occurred in the most recent decade.
Urban areas were affected by the warming occurring as a result of climate change as well as the ‘urban heat island’ effect whereby built-up places trapped heat more than surrounding rural areas
However, although heat waves over urban areas in India had gone up over the 40-year period, the increase was not statistically significant. Similarly, the increase in the number of hot nights was also not significant over India.
High levels of fine particles in the atmosphere (known as aerosols), which reduce the amount of sunlight reaching the ground, may be partly responsible for a slower rate of warming over India.
The most worst effects would be on cities than the rural area.