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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 ...
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 ...
Volcanic activity as a whole has had negligible impacts on global temperature trends since the Industrial Revolution. [ 100 ] Between 1750 and 2007, solar radiation may have at most increased by 0.12 W/m 2 , compared to 1.6 W/m 2 for the net anthropogenic forcing.
A recent study of El Niño patterns suggests that the French Revolution was caused in part by the poor crop yields of 1788–89 in Europe, resulting from an unusually strong El-Niño effect between 1789 and 1793. [19] 1798 Thomas Robert Malthus publishes An Essay on the Principle of Population, thus beginning Malthusian economics.
Some climate change effects: wildfire caused by heat and dryness, bleached coral caused by ocean acidification and heating, environmental migration caused by desertification, and coastal flooding caused by storms and sea level rise. Effects of climate change are well documented and growing for Earth's natural environment and human societies. Changes to the climate system include an overall ...
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.
As of 2022, the level of warming is 1.2 °C (34.2 °F) above levels before the industrial revolution. It is on track to increase to 2.5 to 2.9 °C (36.5 to 37.2 °F) by the end of the century. [14] This is causing a variety of secondary effects. [citation needed]
2018 - The IPCC releases a special report, warning that a 1.5 degree global warming could have disastrous consequences. [31] 2018 - Greta Thunberg starts a school strike for climate, sitting outside the Swedish Parliament. 2019 - Earth Day and National Cleanup Day organize the first coordinated cleanup event held in all 50 States and US Territories