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Global Warming Likely Started Before Industrial Revolution, Study Says

by Stephen Chen
February 08, 2021, 9:52 AM
in News and Opinion
Reading Time: 3 mins read
A A
3

paracel coral reefStudies of coral reefs in the Paracel Islands suggest that the South China Sea started warming up in 1825, at the start of the industrial revolution, according to a study by Chinese scientists.

That was the year the world’s first railway began operating in England and most ocean-going ships still used wind power.

Man-made carbon dioxide emissions could not fully explain such an early rise in the warming trend, they said in a peer-reviewed paper published in Quaternary Sciences on Friday.

The Paracel coral record “will fill in some important gaps in global high resolution marine environment records and help us better understand the history of environmental change in tropical waters,” said the researchers, led by Tao Shichen from the South China Sea Institute of Oceanology.

Coral reefs provide useful climate records because the higher the temperature the faster they grow.

The Paracels have one of the largest living reefs in the Asia-Pacific region, but in recent decades the archipelago has become the focal point of territorial disputes between China and Vietnam, and the construction of infrastructure has threatened the natural environment.

The Chinese study was led by Tao Shichen from the South China Sea Institute of Oceanology. Photo: Tao Shichen

The researchers studied four coral reef samples retrieved from Yongxing and Yongle, two of the largest islands in the Paracels and both controlled by China’s military.

The samples were drilled from locations that have been continuously underwater and suffered minimal disturbance as a result of human activity.

With the help of uranium dating technology, the researchers found the samples contained a continuous climate record going back to 1520.

To ensure the accuracy of the results, parts of the samples were also sent to a laboratory in Queensland, Australia for independent analysis.

The results showed that the temperature 500 years ago was lower than it is today. The cooling trend lasted until 1825.

From that date to the present, there was “a general trend of rapid increase” with the biggest spike reaching 2.3 degrees Celsius, Tao said.

The Chinese team is not the first to carry out such research. In 2016, an international team led by Australian climate researcher Helen McGregor examined the climate records from coral skeletons, ice cores, tree rings, cave deposits, and ocean and lake sediments across the globe.

They found that global warming could have started as early as the 1830s. McGregor and her colleagues argued that carbon dioxide emissions could be the main cause of the temperature increase because the impact of the early stage of the Industrial Revolution might have been underestimated.

But the Chinese team has a different interpretation. Though man-made greenhouse gas emissions certainly existed then, they were unlikely large enough to alter the global climate, they said.

A deeper look into the Paracel coral reef records showed that the fluctuation of temperature in the region matched well with the increase in solar activity in the period.

They also noticed a significant drop in volcano activity in the region, which they said could have contributed to the warming by reducing the amount of light-blocking particles in the atmosphere.

Dating the start of climate change could have some real-life implications, according to a Chinese government climate expert who was not involved in the Paracel study.

The current goal of the Paris Agreement is to keep the temperature increase below 2 degrees Celsius by mid-century. The goal was calculated based on the assumption that the warming started from the end of the 19th century.

h/t Jamie R.

Read rest at South China Morning Post

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Comments 3

  1. Gumnut says:
    5 years ago

    “McGregor and her colleagues argued that carbon dioxide emissions could be the main cause of the temperature increase because the impact of the early stage (pre- 1830s) of the Industrial Revolution might have been underestimated.”

    I would politely suggest that a few months living some of those pre-1830s Australian or British lives would most probably come as a huge shock to McGregor.

    Indeed, at that stage, many McGregors and other Highland Scots were living in “black houses” with stone walls, a thatched roof, rendered ‘black’ by burning fuel for both heat and light, not necessarily with a chimney. The fuel was not usually coal, but dried peat or timber both of which were ‘renewable’. What livestock the family had were often housed in winter in the same building. This is the reality of energy poverty and one we seem hellbent on returning to.

    As one born to a simple country life by modern standards, I know that I could actually cope with that, even though I don’t want it. I am not so sure that most climate alarmists have the capacity to live the sort of life that would meet their theories, for I doubt they’d even recognise such a life if it jumped up and grabbed them.

  2. Jenny Wilson says:
    5 years ago

    Of course, this is NOT news… we’ve been coming out of an ice age for almost 12,000 years…

  3. Dave O says:
    5 years ago

    That’s weird that all we hear from the Alarmist is how coral reefs are irreparably damaged by global warming, but this article says that they can track the increasing temperatures starting in 1825 by increased growth. Strange, could the alarmist be lying to us again or not telling the whole story?

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