Studies have shown that burning natural gas as car fuel produces thirty percent less carbon dioxide than diesel, making it seem to be more eco-friendly. But, the mining and drilling done to collect these gasses cause methane leaks, whose effects are thirty times more potent than carbon dioxide. Studies are showing that there is fifty percent more methane in the atmosphere than what was estimated by the EPA, showing that there is a substantial amount of methane leaking from natural gas mines. Although these studies show that natural gas is harmful because of the methane leaks, if there was an entire switch from coal burning power to natural gas, the production of global warming chemicals would be lower. While there are no federal regulations, some states are considering implementing methane regulating rules in hopes to lower pollution and dependence on foreign oils. Some regulations are going to require that oil companies spend money on policies and technology that will strictly monitor their emissions, causing less methane to be released and more natural gas to be available. Most companies are taking to this voluntarily, and are lowering their emissions, while some have levels that are higher than those allowed by the EPA.