By Sara Shouhayib and Lydia Randall

Gas prices could drop substantially by the end of the year, thanks to the negotiations with Iran over its use of nuclear energy. Experts say gas could drop to $2 or less per gallon by December. With some sanctions being lifted, Iran is now able to sell oil to the U.S. for the first time since 1995. While people at the pumps are happy to have a less costly way to fill their tanks, some are concerned about the potential consequences that could arise from the deal.