The city of San Diego released its first Climate Action Plan monitoring report Thursday, finding that its short-term goal for reducing greenhouse-gas emissions was essentially satisfied before the plan was even approved last December. The report outlined progress on emissions cuts during the past five years and found that by 2015, climate pollution had been reduced by 17 percent below the baseline year of 2010 — surpassing the plan’s targeted 15 percent reduction goal by 2020. The emissions cuts resulted largely from state and federal mandates to green up electrical grids and improve fuel-efficiency standards.