When were carbon dioxide levels as high as they are now?

Name: When were carbon dioxide levels as high as they are now?
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Studies of ice cores have shown that carbon dioxide levels were last as high as they are now around 160,000 years ago during the last interglacial period. This was due to natural factors such as changes in Earth's orbit and solar radiation. However, the current increase in carbon dioxide levels is mainly attributed to human activities such as burning fossil fuels and deforestation.

When Were Carbon Dioxide Levels as High as They Are