NEWS--Researchers have reconstructed atmospheric carbon dioxide levels over the past 2.1 million years in the sharpest detail yet, shedding new light on its role in the earth's cycles of cooling and warming. A first-ever analysis and comparison of the carbon footprints of different countries using a single, trade-linked model has been created by researchers at the Norwegian University of Science and Technology (NTNU) and the Centre of International Climate and Environment Research - Oslo (CICERO). ScienceDaily (June 22, 2009) — Some of the substances that are helping to avert the destruction of the ozone layer could increasingly contribute to climate warming, according to scientists from NOAA's Earth System Research Laboratory and their colleagues in a new study in the journal Proceedings of the National Academy of Sciences.

Africa

Africa is the second largest continent on earth,but it has the most countries of any other continent. Do you think Africa is bigger than the United States? Click here and find out! When you are done, click on the back button that looks like this: Africa is home to the largest desert in the world: the Sahara. Grasslands cover much of the land, and rainforests are in western Africa near the equator. The Nile river is in Africa. It is the longest river in the world! Thousands of species of animals live in Africa and so do many different kinds of people. There are over 1000 languages spoken in Africa. Some of the languages have been spoken for hundreds of years, and some Africans speak the European languages of the explorers and colonists from other countries. Africa is also home to some of the tallest and the shortest people in the world.

Now that you know a little about Africa, Click here to learn even more! Learn about Africa's geography. Click here! Learn about some of the countries of Africa. Click here! Take an African map Quiz Click here! Learn more about different countries in Africa. Click here! When you have learned about some of the countries, click here to see what time it is in your favorite African country.

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NEWS--Researchers have reconstructed atmospheric carbon dioxide levels over the past 2.1 million years in the sharpest detail yet, shedding new light on its role in the earth's cycles of cooling and warming. A first-ever analysis and comparison of the carbon footprints of different countries using a single, trade-linked model has been created by researchers at the Norwegian University of Science and Technology (NTNU) and the Centre of International Climate and Environment Research - Oslo (CICERO). ScienceDaily (June 22, 2009) — Some of the substances that are helping to avert the destruction of the ozone layer could increasingly contribute to climate warming, according to scientists from NOAA's Earth System Research Laboratory and their colleagues in a new study in the journal Proceedings of the National Academy of Sciences.