Credible carbon dating

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Certain human activities have been identified as primary causes of ongoing climate change, often referred to as global warming.Scientists actively work to understand past and future climate by using observations and theoretical models.A climate record—extending deep into the Earth's past—has been assembled, and continues to be built up, based on geological evidence from borehole temperature profiles, cores removed from deep accumulations of ice, floral and faunal records, glacial and periglacial processes, stable-isotope and other analyses of sediment layers, and records of past sea levels.More recent data are provided by the instrumental record.

For the study of past climate change, see paleoclimatology.Climate change may refer to a change in average weather conditions, or in the time variation of weather within the context of longer-term average conditions.Climate change is caused by factors such as biotic processes, variations in solar radiation received by Earth, plate tectonics, and volcanic eruptions.Due to the long timescales of this circulation, ocean temperature at depth is still adjusting to effects of the Little Ice Age A schematic of modern thermohaline circulation.Tens of millions of years ago, continental-plate movement formed a land-free gap around Antarctica, allowing the formation of the ACC, which keeps warm waters away from Antarctica.There are also key threshold factors which when exceeded can produce rapid change.

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