How much warmer Earth's greenhouse effect makes the planet

Earth’s atmosphere keeps the planet warmer

−18 °C Without It

Gases in Earth’s atmosphere trap some heat. Without this greenhouse effect, Earth’s average surface temperature would be about −18 °C instead of about +15 °C. Life as we know it would probably not exist in those colder conditions.

Aristotle described an animal organ centuries before scientists accepted it

Aristotle described a special arm that cephalopods use for reproduction, but later scholars doubted his account. The structure was not widely accepted until the 19th century, centuries after he had described it.

Shared childhood may cue genetic relatedness

An evolutionary-psychology account proposes that people can detect some forms of genetic relatedness from cues such as growing up together or sharing maternal care of an infant. Signals from the major histocompatibility complex are another possible cue.

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How much warmer Earth's greenhouse effect makes the planet

Earth’s atmosphere keeps the planet warmer

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