The health and welfare of every person in America will be affected by global warming, especially children, the elderly and the poor, according to a new White House science report. The report said every region   of the country will suffer worse health from heat waves and drought. _ It predicts an increase in diseases spread by tainted   food, bad water and bugs  . The report concludes that climate change causes real risk to human health and human system that supports the way of life in the United States. Man-made global warming is caused by greenhouse gases from the burning of fossil fuels. At current emission   levels, global temperatures are likely to rise by about 2 degrees by midcentury and about 7.5 degrees by the end of the century. The most vulnerable   Americans -- the poor, elderly, sick, very young and immigrants -- will suffer more. That's at least 10 percent of the country's population, probably more. It will be tougher for these people to get enough health care for climate-related illnesses, to cool down in heat waves, to escape extreme events such as Hurricane Katrina, and even to get enough food. While every region of America is vulnerable to global warming's health and welfare effects, more people are moving to coastal regions, which are most vulnerable to climate change because of drought and hurricanes. The writer wrote this passage to  _  .
explain how the phenomenon of global warming forms protect the vulnerable Americans from suffering from diseases provide evidence that global warming and climate change risk human's health warn every American of the danger of global warming to their health