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Estimates show temperatures during The Medieval Warm Period (approximately 800 to 1300 AD) were warmer than today, and scientists think it may have been the result of decreases in volcanic activity (rather than having anything to do with humans).
Global consumption of coal, oil and gas has surged since the 19th century, which is concurrent with significant increases in both atmospheric carbon dioxide and average global temperature.
Humans have significantly reduced the number of trees on earth - by cutting down forests for farming, grazing livestock, mining, drilling, urbanisation, producing palm oil and harvesting timber for commercial items - limiting the planet's ability to process atmospheric CO2.
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Evidence suggests that a period of cooling (often called the "Little Ice Age"), which occured from the 16th century to 19th century, was a result of increased volcanic activity.
The peak of the last glacial period was only 20,000 years ago. The global temperature was around 5 degrees celcuis colder than today.
There are an estimated 1.2 billion vehicles on the road around the world, the vast majority of which are fossil fuel-powered. Humans are significantly contributing to climate change by using fossil fuel-powered vehicles.
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Solar irradiance has declined in the last 35 years and Milankovitch cycles show that the climate should be cooling, not warming. No natural drivers can account for current climate change; anthropogenic drivers of climate change are all that remain.
The industrial activities of modern civilisation (such as the burning of fossil fuels for electricity) has raised atmospheric concentration of gases, such as carbon dioxide, which contribute to a greenhouse effect.
Estimates drawn from surveys of thousands of scientific papers show that, among actively publishing climate sciencists, there is broad consensus that humans are the cause of climate change.
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Carbon in CO2 from fossil fuels has a different signature to the carbon in CO2 from natural sources. Scientists have deduced that since the start of the industrial era fossil fuels are the biggest contributor to carbon dioxide.
Humans produce atmospheric methane through the global livestock and farming industries, through their decaying waste on landfill sites, and through leakage from the oil and gas industry.
During the climatic optimum, temperatures were 1-2 degrees celcius warmer than they are today. The climatic optimum was one consequence of changes in Earth's orbit as it entered the Holocene.
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Milankovitch cycles result in changes in Earth's climate and last about 100,000 years. They are caused by changes in Earth's orbit and rotation axis (hence maximum sunlight intensity), which changes are themselves caused by gravitational forces of other planets such as Juipter.
Global warming from Earth's axis tilting or its orbit changing usually takes thousands of years. Recent warming has taken place over the last 150 years. Current global warming is unnaturally rapid.
Carbon dioxide emission rates very closely follow global economic growth. CO2 emissions are a byproduct of global economic growth and cause climate change.
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Since the 1960s, climate records have made a significant departure from solar irradiance. Therefore, the sun cannot be the sole cause of recent warming.
Since 1850, solar irradiance has been consistent with changes in climate records, showing that the sun has a dominant influence over Earth's climate.
No evidence that atmospheric CO2 is causing climate change has been produced; all climate simulations are based on an assumption that CO2 is the cause.
Two thirds of atmospheric sulphur dioxide and a quarter of atmospheric nitrus oxide come from the burning of fossil fuels for electricity. Sulfuric and nitric acids form in the atmopshere and fall to the ground with rain.
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Since the CFC ban in the 1980s, the ozone layer has shown signs of recovery. This is tangible evidence that not only shows human activities were a driver of a particular type of climate change, but also shows an activity's regulation can drive reversal of that climate change.
Evidence from ice cores reveal that, following the last Ice Age, temperatures increased for 600-800 years before carbon dioxide levels in the atmopshere increased; a rise in CO2 was the consequence of global warming, not the cause.