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The report described climate change as “an urgent and fundamental challenge”.“The goal of stabilising the temperature increase well under 2C is largely motivated by concerns over the immense potential scale of economic, social, and ecological damages that could result from the failure to manage climate change effectively,” it said.

This technique works well for materials up to around 50,000 years old.

Each radioactive isotope decays by a fixed amount, and this amount is called the half-life.

Scientists often use the value of 10 half-lives to indicate when a radioactive isotope will be gone, or rather, when a very negligible amount is still left.

This is why radiocarbon dating is only useful for dating objects up to around 50,000 years old (about 10 half-lives).

A global carbon tax that would raise trillions of dollars if applied across the world should be introduced if the world is to avoid dangerous climate change, 13 leading economists have said in a new report.

Led by Professor Nicholas Stern, who produced the groundbreaking Stern Report in 2006, and Professor Joseph Stiglitz, who won the Nobel Prize for economics in 2001, the experts suggested a price for a tonne of carbon dioxide of to 0 (£39-78) by 2030.“The transition to a low-carbon economy is potentially a powerful, attractive, and sustainable growth story, marked by higher resilience, more innovation, more liveable cities, robust agriculture, and stronger ecosystems.” The report called for the world to start cutting state subsidies for oil, coal and gas.“Reducing fossil fuel subsidies is another essential step toward carbon pricing – in effect, these subsidies are similar to a negative emissions price,” it said.Libby was awarded the Nobel Prize in chemistry for his work in 1960.Carbon dioxide in the atmosphere contains a constant amount of carbon-14, and as long as an organism is living, the amount of carbon-14 inside it is the same as the atmosphere.The half-life is the time required for half of the original sample of radioactive nuclei to decay.