Claim: "a [cloudcover] change in the Tropics could lead to a negative feedback in the global climate, with a feedback factor of about –1.1, which if correct, would more than cancel all the positive feedbacks in the more sensitive current climate models" (Lindzen et al.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Observations and modelling studies indicate that there is a net positive feedback to warming.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: The impact of this negative feedback effect is included in global climate models summarized by the IPCC.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: The main reinforcing feedbacks are the water vapour feedback, the ice–albedo feedback, and probably the net effect of clouds.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: This hypothesis suggests a negative feedback which would counter the effects of CO 2 warming by lowering the climate sensitivity.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
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: Broadly speaking, if clouds, especially low clouds, increase in a warmer climate, the resultant cooling effect leads to a negative feedback in climate response to increased greenhouse gases.

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

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: The albedo of increased cloudiness cools the climate, resulting in a negative feedback; while the reflection of infrared radiation by clouds warms the climate, resulting in a positive feedback.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Unanimous agreement was found among the models that future climate change will reduce the efficiency of the land and ocean carbon cycle to absorb human-induced CO. As a result, a larger fraction of human-induced CO will stay airborne if climate change controls the carbon cycle.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Effect of ice-albedo feedback on global sensitivity in a one-dimensional radiative-convective climate model.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The probability of abrupt change for some climate related feedbacks may be low.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: There are many feedback mechanisms in the climate system that can either amplify (a positive feedback) or diminish (a negative feedback) the effects of a change in climate forcing.