In an alternate Avatar universe where Aang is the last Earthbender, the fire nation pummels him. Fire burns Earth. Also Katara doesn't like Aang because Earthbenders don't have swag. Aang is sad so he freezes himself again. This time nobody unfreezes him. He is stuck until global warming melts all the ice. By this time Earth and Air benders are unnecessary. Only Waterbends to bend all the excess water and Firebenders for warmth. Aang ends up dying alone because nobody wants to marry a useless Earthbender.