If the U.S produces most of the world's oil, why can't we restrict intl. trade at least until we fix our eco.?

If you know of any links about how much oil the U.S produces let me know.If the U.S produces most of the world's oil, why can't we restrict intl. trade at least until we fix our eco.?
we produce very little..only about 40 percent of what we need. I work for a major oil companyIf the U.S produces most of the world's oil, why can't we restrict intl. trade at least until we fix our eco.?
We get most of ours from South America, we don't consume our own if we don't have to.