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Oct 6, 2025, 1:19 pm122 ptsTrendingPHYSorg
Earth's climate has fluctuated between cold and warm periods for millions of years. During the so-called "lukewarm interglacials"—warm phases between 800,000 and 430,000 years ago—atmospheric CO2 concentrations were only around 240 to 260 ppm (parts per million, i.e., molecules per 1 million molecules of…
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Leaf through planet Earths environmental headlines in one convenient place. Read, share and discover the latest on ecology, science and green living from the web's most popular sites.