But industry experts say governments need to offer incentives for companies to bring sustainable AC technologies to market and scale up. Removing humidity requires cooling air to the point at which water vapour becomes a liquid to be drained. This inability to get rid of humidity without first cooling the air makes conventional ACs less efficient. The company's AC prototype uses these materials to dry out air, aiming to produce fewer emissions than traditional ACs. More than 1 billion people living in warm climates still lack access to cooling, according to nonprofit Sustainable Energy for All.

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Persons: Pedro Rodriguez, Susana Vera, We've, Lily Riahi, Riahi, Sorin Grama, Grama, Gree, Daikin, Miki Yamanaka, Larissa Gross, UNEP's Riahi, Baolong Wang, Wang, Xavier Moya, Gloria Dickie, Katy Daigle, Simon Jessop, Josie Kao Organizations: Puerta del, REUTERS, Rights, International Energy Agency, United Nations Environment Programme's, Cool Coalition, Massachusetts Institute of Technology, Daikin's Global Environment Center, Sustainable Energy, Tsinghua University, University of Cambridge, Reuters, Thomson Locations: Puerta del Sol, Madrid, Spain, Seville, Europe, Spanish, Beijing, Indonesia, Britain, U.S