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magazine has been continuously published since 1978, we are publishing some of the articles from the archives for historical interest, such as this.

For teaching and sharing purposes, readers are advised to supplement these historic articles with more up-to-date ones suggested in the Related Articles below.

Think of it like a teaspoon of cocoa mixed into a cake dough—after a while, the ‘ratio’ of cocoa to flour particles would be roughly the same no matter which part of the cake you sampled.

The fact that the C doesn’t matter in a living thing—because it is constantly exchanging carbon with its surroundings, the ‘mixture’ will be the same as in the atmosphere and in all living things.

­ ­You probably have seen or read news stories about fascinating ancient artifacts.

At an ar­chaeological dig, a piece of wooden tool is unearthed and the archaeologist finds it to be 5,000 years old.

In this article, we will examine the methods by which scientists use radioactivity to determine the age of objects, most notably carbon-14 dating.As soon as it dies, however, the C ration gets smaller.In other words, we have a ‘clock’ which starts ticking at the moment something dies.Pre-industrial (recent history) levels are said to have been at around 280 parts per million.The other very disturbing issue is that the figures below don't include other greenhouse gases such as methane, which are also on the rise.

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This page is regularly updated with atmospheric carbon dioxide level data; based on the previous month in the current year and history of saturation levels for the same month dating back to 1958.