Answer: Negative feedbacks decrease the direct effects of the original process
Positive feedbacks amplify the direct effects of the original process
Feedback Loop: Ocean Warming
The oceans are an important sink for CO2 through absorption of the gas into the water surface.
As CO2 increases, it decreases the ocean's ability to absorb CO2. If air temperatures warm, it should warm the oceans.
The ability of the ocean to remove CO2 from the atmosphere decreases. Because of this, increasing CO2 in the atmosphere could have effects that actually amplify the increase in CO2 in the atmosphere.
This is a positive feedback loop.