Claim: The last time the planet was even four degrees warmer, Peter Brannen points out in The Ends of the World, his new history of the planet’s major extinction events, the oceans were hundreds of feet higher.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Sea levels were high worldwide, and much of the land lay under shallow seas, where tropical reef organisms lived.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: The elevation of the land surface varies from the low point of −418 m (−1,371 ft) at the Dead Sea, to a maximum altitude of 8,848 m (29,029 ft) at the top of Mount Everest.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: As a result, the mean annual air temperature at sea level decreases by about 0.4 °C (0.7 °F) per degree of latitude from the equator.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: In the early and middle Ordovician, temperatures were mild, but at the beginning of the Late Ordovician, from 460 to 450 Ma, volcanoes along the margin of the Iapetus Ocean spewed massive amounts of carbon dioxide, a greenhouse gas, into the atmosphere, turning the planet into a hothouse.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: The Ordovician saw the highest sea levels of the Paleozoic, and the low relief of the continents led to many shelf deposits being formed under hundreds of metres of water.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: In 2018, scientists concluded that high sea levels some 125,000 years ago, which were 6–9 m (20–30 ft) higher than today, were most likely due to the absence of the WAIS, and found evidence that the ice sheet collapsed under climate conditions similar to those of today.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Matthiessen, Peter - End of the Earth : Voyages to Antarctica.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Earth has undergone periodic climate shifts in the past, including four major ice ages.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The deglaciations at the end of The deglaciation that took place In the early Pliocene, global temperatures were 1–2˚C warmer than the present temperature, yet sea level was 15–25 meters higher than today.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: (BBC) 4 April A new, detailed record of past climate change has shown compelling evidence that the last ice age was ended by a rise in temperature driven by an increase in atmospheric carbon dioxide.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: IPCC (2007a:13, 14) projected sea level rise to the end of the 21st century using the [[Special Report on Emissions Scenarios|SRES]] emission [[economics of global warming#Scenarios|scenarios]].

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The Paleocene–Eocene thermal maximum was an approximate 200,000 year long event where the global average temperature rose by some 5 to 8 °C (9 to 14 °F), and mid-latitude and polar areas may have exceeded modern tropical temperatures of 24–29 °C (75–84 °F).

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Studying the association between Earth climate and extinctions over the past 520 million years, scientists from the University of York write, "The global temperatures predicted for the coming centuries may trigger a new ‘mass extinction event’, where over 50 percent of animal and plant species would be wiped out."