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"Scientists have warned we must limit global temperature rise to 1.5 degrees to avoid the worst impacts of climate change. That's compared to the temperatures in 1850-1900, before widespread industrialisation"(UK.BBC)

What makes the temperature in 1875 better? What was the average temp. 850-900 A.D or 850-900 B.C.? What was the average temp 65 million years ago? For what period of Earth's existence did it not have polar ice caps?(Hint (0% of Earths history has been ice cap free)

A "greenhouse Earth" or "hothouse Earth" is a period in which there are no continental glaciers whatsoever on the planet, the levels of carbon dioxide and other greenhouse gases (such as water vapor and methane) are high, and sea surface temperatures (SSTs) range from 28 °C (82.4 °F) in the tropics to 0 °C (32 °F) in the polar regions.[2] The Earth has been in a greenhouse state for about 85% of its history.[3]

This state should not be confused with a hypothetical hothouse earth, which is an irreversible tipping point corresponding to the ongoing runaway greenhouse effect on Venus.[4] The IPCC states that "a 'runaway greenhouse effect'—analogous to [that of] Venus—appears to have virtually no chance of being induced by anthropogenic activities."

Boardwine 8 Jan 16
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