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    Extreme Greenhouse Effect Heated up the Young Earth

    June 1, 2021, Categories  Astronomy/Space

    Greenhouse gases trap energy from the sun in the lower atmosphere. Without these gases, the Earth would be a chilly minus 18 degrees Centigrade. In contrast, the atmosphere on Mars is almost entirely made of carbon dioxide, but it has a very thin atmosphere and little to no methane or water vapour, producing a weaker greenhouse effect. Credit: NASA

    Very high atmospheric CO2 levels can explain the high temperatures on the still young Earth three to four billion years ago. At the time, our Sun shone with only 70 to 80 percent of its present intensity. Nevertheless, the climate on the young Earth was apparently quite warm because there was hardly any glacial ice. This phenomenon is known as the ‘paradox of the young weak Sun...

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