The natural process in which earth surface gets warm is by receiving solar shortwave radiation (solar rays), this gets earth to emit longwave radiation (heat).
Nowadays there is another important cause for the earth to heat up, and it comes from human contamination. It is called greenhouse effect, in this process, some of the gases that humans produce in high amounts (CO2 mainly) are causing long wave radiation (heat) to become trapped in the lower parts of the atmosphere. This makes the temperature rise above natural levels in some parts of the globe, this disrupts the weather in several different ways globally.
