"In climate change we talk about a tipping point, but in oceans and ocean life we are far over that tipping point, " he said.

CNN: Topical waters

Would we care more if we could see the higher concentrations of carbon dioxide being absorbed into our oceans, making seawater more acidic, endangering coral reefs and marine life and threatening to fundamentally disrupt ocean ecosystems and food webs?

CNN: What if carbon dioxide were as black as oil?