Its weather, how bout the historic storms that shaped the coast of California,Galveston Texas 1900s.the global cooling called the little iceage from 1300 to 1800 some say 1850 what caused that, the population of Europe was halved by 1650 from diseases,so everything can be shown historically that weather had an impact.also 2.5 billion, India passed China as most populated country that's 2.5 thousand million and they are not going to compromise there economy's for global warming