Claim: But that conclusion holds true only if there are no other sources of c12 increases which are not human caused.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: The reasoning in this argument is valid, because there is no way in which the premises, 1 and 2, could be true and the conclusion, 3, be false.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: "It is likely that increases in GHG concentrations alone would have caused more warming than observed because volcanic and anthropogenic aerosols have offset some warming that would otherwise have taken place."

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: According to this summary, the Fourth Assessment Report found that human actions are "very likely" the cause of global warming, meaning a 90% or greater probability.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: The statement concludes with a call for "reduction in anthropogenic (human-caused) sources of carbon dioxide and other greenhouse gas emissions contributing to global climate change and the conservation of CO 2- consuming photosynthesizers (i.e., plants)."

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: While ‘climate change’ can be due to natural forces or human activity, there is now substantial evidence to indicate that human activity – and specifically increased greenhouse gas (GHGs) emissions – is a key factor in the pace and extent of global temperature increases.

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: "Warming 'very likely' human-made".

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: Secondly, although the narrator commentary during the presentation of the graph is consistent with the conclusions of the paper from which the figure originates, it incorrectly rules out a contribution by anthropogenic greenhouse gases to 20th century global warming.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Singer argues, contrary to the scientific consensus on climate change, that there is no evidence that global warming is attributable to human-caused increases in atmospheric carbon dioxide, and that humanity would benefit if temperatures do rise.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: A 2017 Politico article states that increased CO 2 levels may have a negative impact on the nutritional quality of various human food crops, by increasing the levels of carbohydrates, such as glucose, while decreasing the levels of important nutrients such as protein, iron, and zinc.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Attributing detected temperature changes and extreme events to human-caused increases in greenhouse gases requires scientists to rule out known internal climate variability and natural external forcings.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Network of African Science Academies: "A consensus, based on current evidence, now exists within the global scientific community that human activities are the main source of climate change and that the burning of fossil fuels is largely responsible for driving this change."