Why Can an Ice Age Happen if Global Climate Change Is Occurring
6. Climate is ever changing. Why is climate change of concern now?
All major climate changes, including natural ones, are disruptive. Past climate changes led to extinction of many species, population migrations, and pronounced changes in the state surface and ocean apportionment. The speed of the current climate change is faster than nearly of the past events, making it more than difficult for human societies and the natural globe to adjust.
Figure 3. Data from ice cores have been used to reconstruct Antarctic temperatures and atmospheric CO2 concentrations over the past 800,000 years. Temperature is based on measurements of the isotopic content of h2o in the Dome C ice cadre. CO2 is measured in
air trapped in water ice, and is a composite of the Dome C and Vostok water ice core. The current CO2 concentration (blue dot) is from atmospheric measurements. The cyclical design of temperature variations constitutes the ice age/ interglacial cycles. During these cycles, changes in CO2 concentrations (in bluish) track closely with changes in temperature (in orangish). Equally the tape shows, the recent increase in atmospheric CO2 concentration is unprecedented in the past 800,000 years. Atmospheric CO2 concentration surpassed 400 ppm in 2016, and the average concentration in 2022 was more 411 ppm. Source: Based on figure past Jeremy Shakun, information from Lüthi et al., 2008 and Jouzel et al., 2007. (larger version)
The largest global-calibration climate variations in Earth's recent geological past are the ice age cycles (come across infobox, p.B4), which are cold glacial periods followed past shorter warm periods [Figure three]. The last few of these natural cycles take recurred roughly every 100,000 years. They are mainly paced by ho-hum changes in Earth's orbit, which alter the mode the Sunday's energy is distributed with latitude and by season on Earth. These orbital changes are very small over the final several hundred years, and alone are not sufficient to cause the observed magnitude of change in temperature since the Industrial Revolution, nor to act on the whole Earth. On ice-age timescales, these gradual orbital variations have led to changes in the extent of ice sheets and in the abundance of CO2 and other greenhouse gases, which in turn take amplified the initial temperature change.
Recent estimates of the increment in global boilerplate temperature since the end of the concluding water ice age are iv to 5 °C (seven to ix °F). That change occurred over a period of about 7,000 years, starting 18,000 years ago. COii has risen more than twoscore% in just the by 200 years, much of this since the 1970s, contributing to man alteration of the planet's energy budget that has so far warmed World by about i °C (one.8 °F). If the rising in CO2 continues unchecked, warming of the same magnitude as the increment out of the water ice age can be expected by the end of this century or soon after. This speed of warming is more than ten times that at the end of an ice age, the fastest known natural sustained change on a global calibration.
Folio last updated: March 2020
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