Earth might face more Heat Waves: NASA

As per warnings of NASA, the Earth might face an intense summer heat wave than what it faced b/w 1951 to 1980. Agency reveals that over the past 30 years the northern hemisphere has seen more "hot", "very hot"and “extremely hot” summers (as classified by the agency).
Earth’s northern hemisphere, which has 90 % of the planet’s land, has become much more susceptible to experience an extreme summer heat wave compared to a base period from 1951 to 1980.