Answer
$CO_{2}=1.239*10^8\frac{kg}{year}$
Work Step by Step
The amount of $CO_{2}$ production in the city is:
$CO_{2}=0.59\frac{kg}{kWh}*700\frac{kWh}{year,house}*300000house=1.239*10^8\frac{kg}{year}$
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