Claim: Murry Salby finds CO2 rise is natural.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: While CO 2 absorption and release is always happening as a result of natural processes, the recent rise in CO 2 levels in the atmosphere is known to be mainly due to human (anthropogenic) activity.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Human activities have caused CO 2 to increase above levels not seen in hundreds of thousands of years.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: These reactions are exothermic and occur naturally (e.g., the weathering of rock over geologic time periods).

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Martian geysers (or CO 2 jets) are putative sites of small gas and dust eruptions that occur in the south polar region of Mars during the spring thaw.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: A 2011 study by noted climate research scientist, Tom Wigley, found that while carbon dioxide () emissions from fossil fuel combustion may be reduced by using natural gas rather than coal to produce energy, it also found that additional methane (CH4) from leakage adds to the radiative forcing of the climate system, offsetting the reduction in forcing that accompanies the transition from coal to gas.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Keeling’s Tellus article of 1960 presented the first monthly CO 2 records from Mauna Loa and Antarctica (1957 to 1960), finding a “distinct seasonal cycle…and possibly, a worldwide rise in CO2 from year to year.” By the 1970s, it was well established that the increase of atmospheric carbon dioxide was ongoing and due to anthropogenic emissions.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Carbon dioxide is naturally captured from the atmosphere through biological, chemical or physical processes.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: ...Dr. James E. Hansen of the National Aeronautics and Space Administration told a Congressional committee that it was 99 percent certain that the warming trend was not a natural variation but was caused by a buildup of carbon dioxide and other artificial gases in the atmosphere.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: "The artificial production of carbon dioxide and its influence on temperature".

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Carbon dioxide () is naturally captured from the atmosphere through biological, chemical, and physical processes.

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: Global warming is the result of increasing atmospheric carbon dioxide concentrations which is caused primarily by the combustion of fossil energy sources such as petroleum, coal, and natural gas, and to an unknown extent by destruction of forests, increased methane, volcanic activity and cement production.