The current primary sources of energy in the world are oil, coal and natural gas? 
 
These fossil fuels are not renewable because they take millions of years to form. The energy of the sun, wind and waves is constantly renewing and does not pollute! It is continuously generated through solar panels, mills, dams, etc. 
 
Scientists predict that over the next 100 years, the Earth could heat up to 1.4 to 5.8 °C. We are currently at the +2 °C barrier… A rise of 6 °C in temperature would be comparable to the shift that made dinosaurs disappear from Earth 65 million years ago.