Answer
$(CO_{2})_{reduction}=6798\frac{lbm}{year}$
Work Step by Step
The total amount of $CO_{2}$ produced is:
$CO_{2}=14000kWh*1.54\frac{lbm}{kWh}+900gal*26.4\frac{lbm}{gal}=21560lbm+23760lbm$
$CO_{2}=45320lbm$
The reduction in the amount of $CO_{2}$ emissions is:
$(CO_{2})_{reduction}=0.15*45320lbm=6798\frac{lbm}{year}$
