Ancient evidence can also be found in tree rings, ocean sediments, coral reefs, and layers of sedimentary rocks. "Ice cores drawn from Greenland, Antarctica, and tropical mountain glaciers show that the Earth's climate responds to changes in greenhouse gas levels.
I really don't know what there is to explain further. This means the earth has taken on higher levels of CO2 as well since man's carbon footprint has increased. What has been uncovered is that over time, these bubbles have increased in frequency and volume. The bubbles of carbon dioxide trapped inside of them indicate the corresponding levels of carbon dioxide found in the atmosphere at that time. Now, what exactly are ice cores? Ice cores are pieces of ice scientists (more like cylinders) that are extracted from an ice sheet or high mountain glacier. Carbon dioxide levels in the atmosphere as demonstrated by ice coresĪncient evidence of carbon dioxide levels can be traced through ice cores. 5 Most of the warming occurred in the past 35 years, with the five warmest years on record taking place since 2010". "The planet's average surface temperature has risen about 1.62 degrees Fahrenheit (0.9 degrees Celsius) since the late 19th century, a change driven largely by increased carbon dioxide and other human-made emissions into the atmosphere.
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