Warren County school buses may be running on a different type of gas in the near future as the Board of Education is considering a gradual transition to natural gas.“Its environmental impact is less. It makes us less reliant on price fluctuations. It’s cheaper in the long run and it’s safe,” said Matt Stennett, chief engineer with Middle Tennessee Natural Gas, who noted 93 percent of natural gas is produced in the United States, meaning a Middle Eastern conflict would not lead to massive shifts in gas prices.Stennett made the pitch before the Board of Education due to a federal initiative which seeks to take diesel buses off the road for environmental reasons.