Global warming is the long term warming of the planets overall temperature, due to ;

Green house gasses

Manufacturing and Industries 

Deforestation

Cow farts

And sunflowers

Now these may seem like the cause, yet last time I remembered the earths CORE is INSIDE the crusts like a loaf of bread, safe from the sun rays. Have you seen any scientists talk about the earth core getting hotter? N-NO!! ITS ACTUALLY LOOSING HEAT!! YEAH TAKE THAT WE NEED THE WARMING! TAKE THAT STEPHEN HAWKING!!

[Megalavania from Undertale is playing when the text is upper case lol]