Claim: Internal variability can only account for small amounts of warming and cooling over periods of decades, and scientific studies have consistently shown that it cannot account for the global warming over the past century.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Attribution of recent climate change is the effort to scientifically ascertain mechanisms responsible for recent global warming and related climate changes on Earth.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Over the past five decades there has been a global warming of approximately 0.65 °C (1.17 °F) at the Earth's surface (see historical temperature record).

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Climate is the statistics (usually, mean or variability) of weather: the classical period for averaging weather variables is 30 years in accordance with the definition set by the World Meteorological Organization.Instrumental temperature records have shown a robust multi-decadal long-term trend of global warming since the end of the 19th century, reversing longer term cooling in previous centuries as seen in paleoclimate records.

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: Thus current evidence does not support globally synchronous periods of anomalous cold or warmth over this interval, and the conventional terms of "Little Ice Age" and "Medieval Warm Period" appear to have limited utility in describing trends in hemispheric or global mean temperature changes in past centuries.... [Viewed] hemispherically, the "Little Ice Age" can only be considered as a modest cooling of the Northern Hemisphere during this period of less than 1°C relative to late twentieth century levels.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Climate change due to internal variability sometimes occurs in cycles or oscillations, for instance every 100 or 2000 years.

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: The warming has not been globally uniform.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: This view ignores the presence of internal climate variability.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Climate change can either occur due to external forcing or due to internal processes.

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: Climate change may be due to internal processes in Earth sphere's and/or following external forcings.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Climate change is the variation in global or regional climates over time.