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NOAA index tracks how greenhouse gas pollution amplified global warming in 2020 - Welcome to NOAA Research
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Key greenhouse gases higher than any time over last 800,000 years | Pursuit by The University of Melbourne
Atmospheric greenhouse gases continue inexorable rise – 2017 was sixth consecutive year CO2 rose by 2 ppm or more – Desdemona Despair
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Climate change: Carbon dioxide levels are higher than they've been at any point in the last 3.6 million years - CBS News
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