Explain climate feedbacks and differentiate between positive and negative feedbacks with examples.

Explain climate feedbacks and differentiate between positive and negative feedbacks with examples.

• A. Processes that amplify or dampen climate changes; positive feedback amplifies (melting ice reduces albedo); negative feedback dampens (increased plant growth removing CO2).
• B. Climate feedbacks always amplify climate change.
• C. Feedbacks occur only in oceans.
• D. Feedbacks are purely economic concepts.

Answer: (A)

Climate feedbacks are processes in the climate system that respond to a change and either amplify it or dampen it. A positive feedback makes the initial change stronger. An example is melting ice: as ice melts, the surface becomes darker (lower albedo) and absorbs more solar radiation, which leads to more warming and more melting in a self-reinforcing loop. Another real-world aspect is that warmer air can hold more water vapor, a potent greenhouse gas, which tends to amplify warming, another form of positive feedback. A negative feedback acts to counter the initial change. For instance, warmer conditions can boost plant growth, and plants remove CO2 from the atmosphere through photosynthesis. Lower CO2 levels reduce the greenhouse effect, which cools the surface and helps offset the warming. Feedbacks operate across the entire climate system, not just in oceans, and they are physical processes, not economic concepts.

Climate feedbacks are processes in the climate system that respond to a change and either amplify it or dampen it. A positive feedback makes the initial change stronger. An example is melting ice: as ice melts, the surface becomes darker (lower albedo) and absorbs more solar radiation, which leads to more warming and more melting in a self-reinforcing loop. Another real-world aspect is that warmer air can hold more water vapor, a potent greenhouse gas, which tends to amplify warming, another form of positive feedback.

A negative feedback acts to counter the initial change. For instance, warmer conditions can boost plant growth, and plants remove CO2 from the atmosphere through photosynthesis. Lower CO2 levels reduce the greenhouse effect, which cools the surface and helps offset the warming. Feedbacks operate across the entire climate system, not just in oceans, and they are physical processes, not economic concepts.