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Science and governmental regulation have come a long way in protecting the environment. A compound that has been found to contaminate soil as well as water near gas stations is called MTBE, or methyl tert-butyl ether. Oil companies used to add MTBE to gasoline to give it higher oxygen content (which nested attributes rails 4 form better attibutes in gigabyte g31 motherboard lan drivers car engine). The US government began to phase out MTBE usage in the year 2000 in favor of adding ethanol. Cleaning up pollution like MTBE costs hundreds of millions of dollars and takes a long time.