Two studies published today in the journal Science provide some of the strongest evidence yet that global warming is here and humans are to blame. The studies, based on computer models, found a direct connection between emissions of greenhouse gases and the extensive warming in the world’s oceans since 1955. They also suggested that even if emissions were to cease immediately, greenhouse gases already in the atmosphere would double the amount of warming in the ocean within two to four decades. One of the study’s lead authors, Tim Barnett of the Scripps Institution of Oceanography, said, “This will make it harder for naysayers to dismiss predictions from climate models.”