Paleoclimate
Researchers have analysed a 3-million-year-old ice core from Allan Hills in Antarctica, measuring atmospheric CO2 at 250 parts per million and methane at 507 parts per billion during the late Pliocene. This epoch featured global temperatures about 1°C warmer than today and sea levels up to 25 metres higher. The levels are lower than previous indirect estimates.
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A study reveals a significant climate change in the South Pacific around 1,000 years ago, with western islands drying out while eastern ones grew wetter. This shift aligned with the last major wave of Polynesian migration eastward. Researchers suggest communities moved to follow reliable rainfall sources across the ocean.