This document summarizes the key effects of climate change from a national and marine perspective. It discusses how global warming is causing temperature increases and sea level rise. It also explains how climate change could alter weather patterns through changes in atmospheric conditions like the North Atlantic Oscillation. The document raises the possibility of a collapse in the Atlantic thermohaline circulation and the combined impacts of greenhouse gases and such a collapse, including additional sea level rise and temperature changes. The summary concludes that global warming presents risks like sea level rise and increased storminess that could impact coastal defenses, offshore engineering, and renewable energy.