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1. CLIMATE

Carbon milestone a reminder of things to come -- scientists

The Earth's atmospheric carbon dioxide levels passed an ominous milestone yesterday when a National Oceanic and Atmospheric Administration observatory on the Big Island in Hawaii registered 400 parts per million for the first time. It's a concentration of CO2 that has not existed in the Earth's atmosphere for at least 3 million years, and it could be enough to trigger 2 degrees Celsius in warming compared with preindustrial levels.

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