Fact 1: Biofuel is used to produce electricity by burning.

Fact 2: Biofuels include ethanol, methanol, biodiesel, biocrude, and methane.

Given the two facts above, answer the question "what does methane produce when burned?" with the following options: 
- carbon dioxide
 - energy
 - electricity
 - The atmosphere
 - heat energy
 - adding heat
 - It expands
 - kinetic energy


 

   electricity      