The latest high-tech equipment permits reliable results to be obtained even with microscopic samples.Radiometric dating is self-checking, because the data (after certain preliminary calculations are made) are fitted to a straight line (an "isochron") by means of standard linear regression methods of statistics.

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For several decades, scientists have measured carbon dioxide at remote surface locations and occasionally from aircraft.

The OCO-2 mission represents an important advance in the ability to observe atmospheric carbon dioxide.

Measurements of carbon dioxide from NASA’s second Orbiting Carbon Observatory (OCO-2) spacecraft are incorporated into the model every 6 hours to update, or “correct,” the model results, called data assimilation.

As the visualization shows, carbon dioxide in the atmosphere can be mixed and transported by winds in the blink of an eye.

Here is one example of an isochron, based on measurements of basaltic meteorites (in this case the resulting date is 4.4 billion years) [Basaltic1981, pg. Skeptics of old-earth geology make great hay of these examples.

For example, creationist writer Henry Morris [Morris2000, pg.A few examples of such lies are presented at the very bottom of this page.For each dating or chronological method there is a link in the box at right to take you to that section of this page.The visualization was created using output from the GEOS modeling system, developed and maintained by scientists at NASA.The height of Earth’s atmosphere and topography have been vertically exaggerated and appear approximately 400 times higher than normal to show the complexity of the atmospheric flow.It is also influenced by natural exchange with the land and ocean.