According to the CIA World Factbook, in 2011 the United States produced an estimated 9,023,000 barrels of crude oil per day (bbl/day), or 10.6% of the world’s crude oil. That is enough to make the United States rank third out of one hundred two oil-producing nations. Saudi Arabia ranks first, producing 11,150,000 bbl/day, or 13.1% of the world’s total. The top ten oil producing countries account for 63.2% of all the oil produced in the world.
According to the World Resources Institute, there are nineteen wetlands of international importance in the United States, which makes the United States tied for nineteenth with India and Pakistan in that category. The United Kingdom ranks first with one hundred fifty-seven internationally important wetlands.
According to the World Resources Institute, in 2000 (the most recent year available on their website) the United States emitted 19,042.50 metric tonnes of non-methane volatile organic compounds, which is enough to make the United States rank first in that category out of 217 ranked countries.
According to the World Resources Institute, there are nineteen extinct bird species in the United States, or 17.6% of all extinct bird species, which makes the United States rank second in the world in that category. Mauritius ranks first, with 21 extinct bird species, or 19.4% of the world’s total.
According to the World Resources Institute, there are 195 amphibian species endemic to the United States. That is enough to make the United States rank seventh in that category. Brazil ranks first, with 454 endemic amphibian species.
According to the British Geological Survey, in 2007 the United States produced 700 tonnes of cadmium, which was enough to make the United States rank eighth in that category. China ranked first, producing 3800 tonnes.