Answer
$Extra_{CO_{2}}=19700lbm$
Work Step by Step
The extra amount of gasoline gallons per year is:
$850gal-650gal=200gal$
The extra amount of $CO_{2}$ realeased to the atmosphere per year is:
$200gal*\frac{19.7lbm}{gal}=3940lbm$
By $5years$:
$Extra_{CO_{2}}=3940lbm*5=19700lbm$
