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500 million years of climate change Ice core data for the past 400,000 years, with the present at right. Note length of glacial cycles averages ~100,000 years. Blue curve is temperature, green curve is CO 2, and red curve is windblown glacial dust (loess). Scale: Millions of years before present, earlier dates approximate.
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 ...
Opinion: There is only one side to climate change, which is on track to make humanity extinct, writes Thomas Alex.
Nearly all of the world's population experienced higher temperatures from June to August as a result of human-induced climate change, according to a peer-reviewed research report published late on ...
Through the creation of multilateral treaties, agreements, and frameworks, international policy on climate change seeks to establish a worldwide response to the impacts of global warming and environmental anomalies. Historically, these efforts culminated in attempts to reduce global greenhouse gas emissions on a country-by-country basis. [1]
Recent evidence indicates that humans processed (gathered) and consumed wild cereal grains as far back as 23,000 years ago. [1] c. 20,000 BC: Antarctica sees a very rapid and abrupt 6 °C increase in temperatures [2] c. 19,000 BC: Last Glacial Maximum/sea-level minimum: c. 20,000 BC c. 12,150 BC Mesolithic 1 period c. 17,000 BC c. 13,000 BC
Human-caused increases in greenhouse gases are responsible for most of the observed global average surface warming of roughly 0.8 °C (1.5 °F) over the past 140 years. Because natural processes cannot quickly remove some of these gases (notably carbon dioxide) from the atmosphere, our past, present, and future emissions will influence the ...