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My understanding is that the effect is a hypothesis. As the oceans warm up, they may absorb less CO2 than they do now, which may lead to acidification.
Before the petition was formally lodged, it was hosted on the e-petition site, where it gained 1,116 signatures in the period from 10 May 2005 to 26 August 2005. The e-petition received eight comments, all of which supported its terms.