Climate Change is Weakening the Ocean Currents That Shape Weather on Both Sides of the Atlantic The change in the main ocean heat pump could bring more heat waves to Europe, increase sea level rise in North America and force fish to move farther north. Related Share this article Since the end of the last ice age, a swirling system of ocean-spanning currents has churned consistently in the Atlantic, distributing heat energy along the ocean surface from the tropics toward the poles, with heavy, cold water slowly flowing back toward the equator along the bottom of the sea. Collectively known as ...