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There are over 307 million people in the United States and more than 6.7 billion people across the globe. (US Census Bureau)

According to the U.S. State Department, there are currently 194 countries in the world.

The peak of Mount Everest is the highest point on Earth at 29,028 feet. The lowest point on dry land is the shore of the Dead Sea at 1,312 feet below sea level.

The United States is the 3rd most populated country in the world after China and India. (United Nations)

Monaco is the most densely populated country in the world, while the United States ranks 177 in terms of population density. (United Nations)

In 2008, the United Nations reported that more than 70% of the citizens of Madagascar and Sierra Leone live below the poverty line.

More than 90% of the population in Burundi, Malawi, Liberia and Tanzania lives on less than $2 a day. (United Nations)

According to the Energy Information Administration in 2007, 56% of the world's oil reserves are found in the Middle East, 16% are found in North America, and 8% are found in South and Central America.

Around the world, 80 countries are using wind power on a commercial basis. (Worldwatch Institute)