Radiocarbon dating is a 70-year-old technique now used with increasing precision to date anything once alive from the last 50,000 years.It exploits the natural ratio of two isotopes of carbon in the atmosphere.When carbon dioxide exhausts from combustion engines reach the atmosphere, they increase the levels of non-radioactive carbon, artificially ageing the atmosphere and, accordingly the new growths that exploit the atmospheric carbon.Dr Graven warns that now, from the point of view of an archaeologist using radiocarbon dating, the planet’s atmosphere is ageing at the rate of 30 or so years for every year of international inaction.If there are no steps to reduce emissions, then by 2050 the atmosphere will have a signature of what carbon ratios were 1,000 years ago.By 2100, just one human lifetime away, the atmospheric clock will have been turned back to the era of Imperial Rome.
Living organisms absorb a proportional amount of radioactive carbon fourteen isotopes to what is constantly present in the earth’s atmosphere.
According to the Gregorian calendar, it is the year 2009 AD. The Kaliyuga Hindu Calendar maintains it is 5110, the Islamic calendar 1430 and the Persian, 2630.
Chances are, right now, you have a Gregorian calendar stuck to your wall.
This calendar, with the months January through December, is a business standard used in many places round the world to define the year: one which hearkens back to Christian and Roman Imperial precedents.
But other timekeeping methods exist and are still used in the modern world, circumventing the easy processing of dates and history between cultures.