Carlos, to be serious, there are lots of the factors that have to be taken into consideration. Whoopsy is right about the core, but there is also sun activity, changes in atmospehere and so on. All these changes are not linear. They can happen fast, and long and the human influence on it... the same as cows one. Its there but for planet health its not so important. 

Also, every planet, is a balanced organism. If somewhere there is warmer, that means that somewhere its becoming colder. Its not about warming everywhere.