Question

The atmosphere of Venus is composed primarily of _____.

Answer 1

Co2 
Carbon dioxide 

Volcanos releases tons of Co2 into VENUS'S atmosphere. Most machinery pumps out Co2 from the fuels we use, so hey we might look like that if we keep using fossil fuels    

Answer 2

I am pretty sure that 96.5% is composed of carbon dioxide. The other 3.5% is composed of nitrogen and other gasses.