Fact 1: Some light bulbs convert electricity into light and heat energy.

Fact 2: CFLs waste much less electrical energy generating unnecessary heat.

Given the two facts above, answer the question "Some light bulbs waste less of their energy producing what?" with the following options: 
- O3
 - loss
 - SO2
 - heat
 - warmth
 - light
 - Green
 - motion


 

    heat     