Claim: Unlike the simple example of positive feedback we learned in high school, the increase from every round of feedback gets smaller and smaller, in the case of the enhanced greenhouse effect.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Since water vapor is a greenhouse gas, the increase in water vapor content makes the atmosphere warm further; this warming causes the atmosphere to hold still more water vapor (a positive feedback), and so on until other processes stop the feedback loop.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Positive feedback amplifies the change in the first quantity while negative feedback reduces it.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: This releases more stored carbon into the atmosphere than the carbon cycle can naturally re-absorb, as well as reducing the overall forest area on the planet, creating a positive feedback loop.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: In contrast, positive feedback is feedback in which the system responds so as to increase the magnitude of any particular perturbation, resulting in amplification of the original signal instead of stabilization.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: That is, the effects of a perturbation on a system include an increase in the magnitude of the perturbation.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Because water vapor is a greenhouse gas, this results in further warming and so is a "positive feedback" that amplifies the original warming.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: One source of abrupt climate change effects is a feedback process, in which a warming event causes a change that ads to further warming.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Currently the increase in human population and the environmental impact of their activities, such as the multiplication of greenhouse gases may cause negative feedbacks in the environment to become positive feedback.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The main positive feedback in global warming is the tendency of warming to increase the amount of water vapor in the atmosphere, which in turn leads to further warming.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The feedback due to water vapor is a major factor in determining how much warming would be expected to occur with increased atmospheric concentrations of carbon dioxide, and all existing computer models assume positive feedback — that is, that as the climate warms, the amount of water vapour held in the atmosphere will increase, leading to further warming.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Climate change can have an effect on the [[carbon cycle]] in an interactive "feedback" process .

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: A [[positive feedback]] intensifies the original process, and a negative feedback reduces it (IPCC, 2007d:78).

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Some climate systems exhibit amplification (positive feedback) and damping responses (negative feedback).