Environmental Friendly Air Conditioners are they Possible?

We all know environment is a beautiful gift to us. It is also one of the basic public assets of a human system, and it must be protected by special means. According to a report as of 2009, nearly 90 percent of American homes have air-conditioners, which account for about 6 percent of all the countrys residential energy use which is a big amount. All that air-conditioning gives us about 100 million tons of carbon dioxide each year. The paper summaries the conditions for sustainable development, tools, methods and techniques to solve the environmental problems.