Climate change refers to a long term shift in weather conditions and patterns of exetreme weather events.
Today,evidence that the Earth climate is changing is leading researchers to view the long-standing relationship between climate and disease from a global perspective.Increase in atmospheric and surface temperatures are already contributing to the worlwide burden of disease and premature deaths, and are anticipated to influence the transmission dynamics goegraphic distribution of malaria, fever and cholera. Global warming is also accelerating the worldwide hydrological cycle, increasing the intensity, frequency, and duration of droughts; heavy precipitation events; and flooding . Such extreme weather events have been increasing and have been linked to global warming . These weather events may, in turn, contribute to and increase the risk for a wide range of vector- and non-vector-borne diseases in humans, plants, and animals .