Although the boron variations may be evidence of extreme climate change , they need not imply a global glaciation .
This may indicate a buildup of carbon dioxide in the atmosphere , some of which would dissolve into the oceans to form carbonic acid .
Although the boron variations may be evidence of extreme climate change , some need not imply a global glaciation .
This may indicate a buildup of carbon dioxide in the atmosphere , some of which would dissolve into the oceans to form carbonic acid .