claim: Nor is there any evidence that levels as high as 7,000 ppm of CO2 did or could cause ocean acidity.
evidence: Evidence from the geological record is consistent with the physics that shows that adding large amounts of carbon dioxide to the atmosphere warms the world and may lead to: higher sea levels and flooding of low-lying coasts; greatly changed patterns of rainfall; increased acidity of the oceans; and decreased oxygen levels in seawater.