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From ancient times, people suspected that the climate of a region could change over the course of centuries. For example, Theophrastus, a pupil of Ancient Greek philosopher Aristotle in the 4th century BC, told how the draining of marshes had made a particular locality more susceptible to freezing, and speculated that lands became warmer when the clearing of forests exposed them to sunlight.
One of the hotter periods was the Last Interglacial, around 125,000 years ago, where temperatures were between 0.5 °C and 1.5 °C warmer than before the start of global warming. [40] This period saw sea levels 5 to 10 metres higher than today. The most recent glacial maximum 20,000 years ago was some 5–7 °C colder. This period has sea ...
By far the best observed period is from 1850 to the present day, with coverage improving over time. Over this period the recent instrumental record, mainly based on direct thermometer readings, has approximately global coverage. It shows a general warming in global temperatures. Before this time various proxies must be used.
Venetian Arsenal in Venice, Italy is founded, employed 16,000 at its peak for the mass production of sailing ships in large assembly lines, hundreds of years before the Industrial Revolution: 1150 Renaissance of the 12th century in Europe, blast furnace for the smelting of cast iron is imported from China: 1185 First record of windmills in Europe
The term "pre-industrial" is also used as a benchmark for environmental conditions before the development of industrial society: for example, the Paris Agreement, adopted in Paris on 12 December, 2015 and in force from 4 November, 2016, "aims to limit global warming to well below 2, preferably to 1.5 degrees celsius, compared to pre-industrial ...
A study in 2020 estimated that the average global temperature during the warmest 200 year period of the HCO, around 6,500 years ago, was around 0.7 °C warmer than the mean for nineteenth century AD, immediately before the Industrial Revolution, and 0.3 °C cooler than the average for 2011-2019. [6]
This has led to increases in mean global temperature, or global warming. The likely range of human-induced surface-level air warming by 2010–2019 compared to levels in 1850–1900 is 0.8 °C to 1.3 °C, with a best estimate of 1.07 °C. This is close to the observed overall warming during that time of 0.9 °C to 1.2 °C.
The Holocene Climatic Optimum (HCO) was a period of warming throughout the globe but was not globally synchronous and uniform. [45] Following the HCO, the global climate entered a broad trend of very gradual cooling known as Neoglaciation, which lasted from the end of the HCO to before the Industrial Revolution. [43]
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