And as the world heats, demand for air conditioners will only grow, especially in developing countries. Air conditioning units line a side of a building in downtown New Delhi. Other entrants focused on the limitations of current air conditioning units, such as the lack of control over both temperature and humidity at the same time. This is when the real challenge begins: convincing the world that traditional air conditioners need replacing. Air conditioners hang on the wall of an office building in Fuzhou, Fujiang Province of China.

Source: CNN November 29, 2019 11:36 UTC