As per my concern this is just a concept where the whole globe is circle due to the expeditions which had happen to have in the past. Mostly the way it goes and the work tasks which happens to work is one of the best concepts which happend to reveal. So here is my simple concept of why the middle globed countries are getting more hotter than the ones are far away from then middle which is the ones are close to ice circle in the world As we learnt in our small ages many yet to know when the light is travelling through different media the signals strenght is getting vary due to its media attributes so basically its get varied when it reaches the earths atmosphere more likely the atmosphere is thicker than the Outter space variables