Claim: “We’ve known about [the greenhouse effect] for more than a century.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Scientists have known for over a century that even this small proportion has a significant warming effect, and doubling the proportion leads to a large temperature increase.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: In 1896, he published the first climate model of its kind, showing that halving of CO 2 could have produced the drop in temperature initiating the ice age.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: This phrase next appeared in a November 1957 report in The Hammond Times which described Roger Revelle's research into the effects of increasing human-caused CO 2 emissions on the greenhouse effect: "a large scale global warming, with radical climate changes may result".

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: The effect of combustion-produced carbon dioxide on the global climate, a special case of the greenhouse effect first described in 1896 by Svante Arrhenius, has also been called the Callendar effect.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: The "greenhouse effect", substantially responsible for Earth's global warming, was first described in 1824 by the French mathematician Joseph Fourier.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Global warming refers to the warming caused by human technology since the 19th century or earlier.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: A runaway greenhouse effect involving carbon dioxide and water vapor has long ago been hypothesized to have occurred on Venus, this idea is still largely accepted[citation needed].

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Climate change is a long-term, sustained trend of change in climate.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Carbon dioxide is the most significant long-lived greenhouse gas in Earth's atmosphere.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Carbon dioxide is often mentioned in the context of its increased influence as a greenhouse gas since the pre-industrial (1750) era.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The greenhouse effect is a process by which thermal radiation from a planetary atmosphere warms the planet's surface beyond the temperature it would have in the absence of its atmosphere.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
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): 0
Passage: There is considerable evidence that over the very recent period of the last 100–1000 years, the sharp increases in human activity, especially the burning of fossil fuels, has caused the parallel sharp and accelerating increase in atmospheric greenhouse gases which trap the sun's heat.