Global Warming

Climate Change: How do we know?

NASA:  Global Climate Change Vital Signs of the Planet Climate change: How do we know? This graph, based on the comparison of atmospheric samples contained in ice cores and more recent direct measurements, provides evidence that atmospheric CO2 has increased since the Industrial Revolution. (Credit: Vostok ice core data/J.R. Petit et al.; NOAA Mauna Loa …

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