If an extra single degree of heat can be prevented, then it can make a massive difference in the life-or-death situation for the ecosystems and the multitudes of people in the coming decades. But a little hope has been provided by the international panel of scientists that the world will awaken to the challenge. Details provided by the U.N. organization on how the weather of the Earth, ecosystems and health of the people would be in a better position if the leaders of the world can limit the future human-caused warming to just 0.9 degrees Fahrenheit from now, instead of the 1.8 degrees F which is the globally agreed-upon goal. Among other affects, half of the people will suffer from lack of water; death rates will decrease due to heat, infectious diseases, and smog; it can also save most of the coral reefs of the world too.