Climate recoveryDate: 03 November 2021 Tags: Climate Change
A report by the Intergovernmental Panel on Climate Change (IPCC) has warned that by 2100 the average global temperatures would breach the two degrees Celsius.
A study of global temperature rise that occurred 56 million years ago was conducted by a research team.
The study showed that the climate stabilized after 20,000 to 50,000 years after a rise of five to eight degrees Celsius.
A natural period of global warming known as the Paleocene-Eocene Thermal Maximum (PETM) was witnessed by Earth many years ago.
Huge amounts of carbon dioxide were released into the atmosphere triggered by a volcanic eruption event.
Ocean surfaces in higher latitudes saw their temperature increase by 8 degree Celsius. This acidification caused mass extinctions in the deep ocean.
The team analyzed rocks, single-celled marine organisms, clay minerals, and lithium isotopes to identify changes that took place.
The global warming event resulted in erosion of rocks. These eroded rocks released lithium in water bodies. By studying the lithium isotopes, erosion levels can be understood.
Lithium is not used by plants or biology. The amount of lithium that is released can only come from erosion process.
They also studied single-celled organisms with calcareous shells known as planktonic foraminifera, which lived millions of years ago.
The PETM had high rise in temperatures but was slow. The current rise is restricted to only 3-4 degree Celsius but is very quick.
The recovery period will probably be broadly similar in timing. The findings will only hold if there is significant reduction in CO2 emissions.
Scientists are looking at a way known as ‘enhanced weathering’ which involves grinding up rock into powder and ploughing it into fields, where it can remove CO2 and act as a fertilizer.