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Study Suggests That Earth’s climate past points to overheated future


According to the first 2-million-year reconstruction of the surface temperatures, our planet may become intolerably hot even if the greenhouse gases in the atmosphere stay at the current levels.Research in the peer-reviewed science journal ‘Nature’ reveals that the stabilisation at today’s greenhouse gas levels may already employ Earth to an ultimate total warming of five degrees Celsius over the following few millennia.This was the middle of a prognosticated warming range of 5.4 F or 3 degrees Celsius to 7 degrees Celsius.


The study says that, in the long run, even 3 degrees Celsius would release a maelstrom of climate variation impacts including storm swells engorged by rising seas, deadly heat waves and severe flooding.The UN’s IPCC or the Intergovernmental Panel on Climate Change has stated that prevailing atmospheric concentrations of the principal greenhouse gas CO2, only over 400 parts per million (ppm), would, over the following century, drive average global temperatures 2 to 2.4 degrees Celsius over the pre-industrial period benchmark.The Intergovernmental Panel on Climate Change or IPCC had inferred that global warming of 2 degrees Celsius was a comparatively safe limit for humanity for many regions.However, a new crescendo of climate-enhanced extreme weather forced world leaders to write an even more strict temperature cap of “well under two degrees” in the Paris Agreement, which was inked by around 195 nations in December.


The scientists announced at a conference in Oxford that the planet has previously heated up 1.8F or 1 degree Celsius beyond the pre-industrial benchmark and could mark its first year at 1.5 degrees Celsius, not beyond a decade.Carolyn Snyder, who is a palaeoclimatologist, from Stanford University’s Interdisciplinary Program in Environment and Resources, conducted a new study and it is the first to put together a continuous record of average surface temperatures extending back two million years.


A few parts of Earth’s climate history have been comparatively easy to reconstruct: there is an extended agreement, for instance, on sea surface temperatures, on carbon dioxide levels and sea level, going back about millions of years.But the proof of the variation in air temperatures has been harder to come by.In what a climate expert not involved in the study named “an original approach”, Snyder cited 20,000 bits of data from around 59 ocean sediment cores, in order to build a temperature timeline at 1,000-year interims.