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A pair of coal trains idled on the tracks near Dry Fork Station, a coal-fired power plant near Gillette, Wyo., in April 2010. For the first time since humans have been monitoring, atmospheric concentrations of carbon dioxide have exceeded 410 parts per million averaged across an entire month, a threshold that pushes the planet ever closer to warming beyond levels that scientists and the international community have deemed "safe."
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Scientists say carbon-dioxide readings mean Earth is nearing 'dangerous territory'