The extent of future warming of Earth's climate is hard to predict because of
the interplay of positive and negative feedback loops. In the context of a
warming atmosphere, which of the following is the best example of a positive
feedback loop in the atmosphere-hydrosphere system that would increase
warming?
Higher ocean temperatures increase the release of methane from the ocean floor,
raising methane levels in the atmosphere.
A rise in atmospheric temperatures increases evaporation rates from the ocean
surface, generating more cloud cover.
Increased carbon dioxide dissolved in the oceans damages coral reefs,reducing
respiration and productivity of marine organisms.
A longer melt season in the Arctic leads to greater absorption of solar energy,
increasing carbon fixation by plankton.