New research explains how mod­erate increases in ocean acid­i­fi­ca­tion and tem­per­a­ture can enhance the growth rates of some reef-forming corals. Authors of a new report attribute the coral's pos­i­tive response to mod­er­ately ele­vated carbon dioxide to the fer­til­iza­tion of pho­to­syn­thesis within the coral's algal sym­bionts, which may pro­vide the coral with more energy for cal­ci­fi­ca­tion even though the sea­water is more acidic....