Shadab ghazali

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Why Ancient Earth Was So Warm

Greenhouse gases in the atmosphere kept the planet toasty, model shows.<p><b>Some three to four billion years ago, Earth was about as warm as it is today, but the sun was much dimmer.</b><p>This so-called faint young sun paradox, first identified by astronomer Carl Sagan in the early 1970s, has flummoxed many a …