High Quality Content by WIKIPEDIA articles! Climate change has brought about severe and possibly permanent alterations to our planets’ geological, biological and ecological systems. The Intergovernmental Panel on Climate Change (IPCC) now contends that “there is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities”. These changes have led to the emergence of large-scale environmental hazards to human health, such as ozone depletion, loss of biodiversity, stresses to food-producing systems and the global spread of infectious diseases. The World Health Organization (WHO) estimates that 160,000 deaths, since 1950, are directly attributable to climate change. Many believe this to be a conservative estimate.