World warming related to large accumulations of carbon dioxide in the environment over hundreds of thousands of years, emitted primarily by volcanic exercise, is the proposed trigger for melting a snowball Earth.
the boron variations could also be proof of extreme local weather change , they need not imply a worldwide glaciation.
photosynthesizers, each protists and algae , are typically very barely depleted in 13C, relative to the abundance found in the main volcanic sources of Earth’s carbon.
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