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<blockquote data-quote="Lily" data-source="post: 1212840" data-attributes="member: 1283">Google, bitch...&quot;The <a href="https://icecores.org/about-ice-cores" target="_blank">NSF-ICF reports</a> that ice cores preserve evidence of much lower levels of atmospheric carbon dioxide than today. Since the start of the Pleistocene Epoch, roughly 2 million years ago, some periods in which glaciers retreated (called glaciations and interglacials) caused massive swings in carbon dioxide. For a period of at least 800,000 years, CO2 concentrations ranged from 180 to 300 parts per million, according to a <a href="https://doi.org/10.1038/nature06949" target="_blank">high-resolution ice-core record</a> from Antarctica.Since the start of the <a href="https://www.climate.gov/news-features/climate-qa/what-evidence-exists-earth-warming-and-humans-are-main-cause" target="_blank">Industrial Age</a>, however, human-caused greenhouse-gas emissions have steadily raised CO2 concentrations. The National Oceanic and Atmospheric Administration (NOAA) <a href="https://gml.noaa.gov/ccgg/trends/weekly.html" target="_blank">Global Monitoring Laboratory reports</a> that, as of the week beginning February 26, 2023, CO2 emissions stood at 421.91 parts per million.Compared to ancient atmospheric composition, today’s atmosphere has more carbon dioxide, and that carbon dioxide has a smaller proportion of carbon-14. Both these facts show the effect of human activity and the burning of massive amounts of fossil fuel.&quot;[URL unfurl=&quot;true&quot;]https://nsidc.org/learn/ask-scientist/core-climate-history#:~:text=Burning%20fossil%20fuels%20does%20two,massive%20amounts%20of%20fossil%20fuel.[/URL]</blockquote>

[QUOTE="Lily, post: 1212840, member: 1283"] Google, bitch... "The [URL='https://icecores.org/about-ice-cores']NSF-ICF reports[/URL] that ice cores preserve evidence of much lower levels of atmospheric carbon dioxide than today. Since the start of the Pleistocene Epoch, roughly 2 million years ago, some periods in which glaciers retreated (called glaciations and interglacials) caused massive swings in carbon dioxide. For a period of at least 800,000 years, CO2 concentrations ranged from 180 to 300 parts per million, according to a [URL='https://doi.org/10.1038/nature06949']high-resolution ice-core record[/URL] from Antarctica. Since the start of the [URL='https://www.climate.gov/news-features/climate-qa/what-evidence-exists-earth-warming-and-humans-are-main-cause']Industrial Age[/URL], however, human-caused greenhouse-gas emissions have steadily raised CO2 concentrations. The National Oceanic and Atmospheric Administration (NOAA) [URL='https://gml.noaa.gov/ccgg/trends/weekly.html']Global Monitoring Laboratory reports[/URL] that, as of the week beginning February 26, 2023, CO2 emissions stood at 421.91 parts per million. Compared to ancient atmospheric composition, today’s atmosphere has more carbon dioxide, and that carbon dioxide has a smaller proportion of carbon-14. Both these facts show the effect of human activity and the burning of massive amounts of fossil fuel." [URL unfurl="true"]https://nsidc.org/learn/ask-scientist/core-climate-history#:~:text=Burning%20fossil%20fuels%20does%20two,massive%20amounts%20of%20fossil%20fuel.[/URL] [/QUOTE]

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