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Related Question on Metaculus:
Over the last few centuries, the concentration of carbon dioxide in Earth's atmosphere has risen from approximately 280 parts per million (pre-industrial) to approximately 410 ppm [1]. Atmospheric carbon dioxide is one of the contributing factors driving climate change via the greenhouse effect.
The trend follows a seasonal cycle that reaches its peak in May, and has also risen at an average rate of around 2ppm annually in the last ten years.