<span>Farmer's were greatly affected by the dust bowl. The dust bowl was a huge drought in the Great Plains of the USA. With no rain, crops were not able to grow. When crops don't grow, farmers have no means of providing for their families.</span>
Coal-burning factories and increased automobile usage has caused the greatest increase in "<span>A) air pollution," since in fact coal when burned is one of the worst pollutants. </span>
