Climate change is presenting a further and wide-ranging challenge with new and emerging threats to the sustainability and productivity of a key economic and environmental resource. This report attempts to focus the numerous impacts on the marine environment in order to assess how multiple stresses including climate change might shape the marine world over the coming years and decades. It presents worrisome findings and requests governments to respond with ever greater urgency in order to combat global warming and to conserve and more strategically manage the oceans and seas and their extraordinary but shrinking resources.