Birds raised 4 meat are "free range" if producers claim they have continuous free access to the outdoors 4 more than what % of their lives?

How many protected areas( parks, wildlife refuges and other reserves) are in the world?

World military expenditure in 2006 is estimated to have reached $____billion in current dollars.

How many years did Nelson Mandela serve as a political prisoner?

How much of the earth's land surface is affected by desertification?

The World Health Organization estimates that every $1 invested in improved water supply and sanitation yields gains of how much?

About what fraction of Africa's population continues to face chronic hunger today?

How many pieces of paper does the average household throw away every year in the United States?

A short, four-mile round trip by bicycle keeps how many pounds of pollutants out of the air we breathe?