Claim: Neither the rate nor the magnitude of the reported late twentieth century surface warming (1979–2000) lay outside normal natural variability.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Currently, surface temperatures are rising by about 0.2 °C per decade.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: In the scientific literature, there is an overwhelming consensus that global surface temperatures have increased in recent decades and that the trend is caused mainly by human-induced emissions of greenhouse gases.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: The disputed issues include the causes of increased global average air temperature, especially since the mid-20th century, whether this warming trend is unprecedented or within normal climatic variations, whether humankind has contributed significantly to it, and whether the increase is completely or partially an artifact of poor measurements.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Before the Industrial Revolution, naturally occurring amounts of greenhouse gases caused the air near the surface to be warmer by about 33 °C (59 °F) than it would be in their absence.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: From this, he concluded that "The post-1980 global warming trend from surface thermometers is not credible.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Our results show that the observed rapid rise in global mean temperatures seen after 1985 cannot be ascribed to solar variability, whichever of the mechanisms is invoked and no matter how much the solar variation is amplified.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: IPCC AR4 WG1 Ch9 2007, p. 690: "Recent estimates indicate a relatively small combined effect of natural forcings on the global mean temperature evolution of the second half of the 20th century, with a small net cooling from the combined effects of solar and volcanic forcings."

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Since the start of the 20th century, the global mean surface temperature of the Earth has increased by more than 0.7°C and the rate of warming has been largest in the last 30 years.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The warming has not been globally uniform.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: "Recent oppositely directed trends in solar climate forcings and the global mean surface air temperature" (PDF).

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Natural changes in the climate system result in internal "climate variability".

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Over 1979 to 2012 the trend for land was about 0.254 ± 0.050 °C per decade per CruTemp4 or 0.273 ± 0.047 per GHCN while the trend for sea surface temperatures is about 0.072 ± 0.024 °C per decade per HadISST to 0.124 ± 0.030 °C per decade per HadSST3.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Ljungqvist 2010 "A New Reconstruction of Temperature Variability in the Extra-Tropical Northern Hemisphere During the Last Two Millennia".