Why is it still so hot?

From the geographical and meteorological point of view, subtropical high has been persistent in most parts of the northern hemisphere, resulting in shortened rainy season and hot and dry climate.

However, due to the accumulation of automobile exhaust emissions in recent ten years, the so-called "greenhouse effect" has been formed under the earth's ozone layer, resulting in the inability to dissipate heat in time and completely during the day.

The decrease of trees and farmland, large-scale urban construction land, cement and steel bar have small specific heat capacity and slow heat dissipation.