Claim: Increasing CO2 in the atmosphere has little to no effect.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Increases in atmospheric concentrations of CO 2 and other long-lived greenhouse gases such as methane, nitrous oxide and ozone have correspondingly strengthened their absorption and emission of infrared radiation, causing the rise in average global temperature since the mid-20th century.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Higher atmospheric CO2 concentrations have led to an increase in dissolved CO2, which causes ocean acidification.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Increased concentrations of gases such as CO 2 (~20%), ozone and N 2O are external forcing on the other hand.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Some climate change denial groups say that because CO 2 is only a trace gas in the atmosphere (roughly 400ppm, or 0.04%, 4 parts per 10,000) it can only have a minor effect on the climate.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: In the 1998 paper, "CO2-induced global warming: a skeptic's view of potential climate change" Idso said: "Several of these cooling forces have individually been estimated to be of equivalent magnitude, but of opposite sign, to the typically predicted greenhouse effect of a doubling of the air’s CO2 content, which suggests to me that little net temperature change will ultimately result from the ongoing buildup of CO2 in Earth's atmosphere.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Rennie 2009: "Claim 1: Anthropogenic CO2 can't be changing climate, because CO2 is only a trace gas in the atmosphere and the amount produced by humans is dwarfed by the amount from volcanoes and other natural sources.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Ocean acidification is an effect of rising concentrations of [[Carbon dioxide|CO]] in the atmosphere, and is not a direct consequence of global warming.

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: Analysis of carbon isotopes in atmospheric CO 2 shows that the recent observed CO 2 increase cannot have come from the oceans, volcanoes, or the biosphere, and thus is not a response to rising temperatures as would be required if the same processes creating past lags were active now.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Because CO is close to saturation with high concentrations and few infrared absorption bands, the radiation budget and hence the greenhouse effect has low sensitivity to changes in CO concentration: the increase in temperature is roughly logarithmic.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The above equation states that the entropy of the atmosphere does not change with height.