Scientists have apparently suggested that a proposed Anthropocene geological era (when humans became important factors in terms of terraforming our planet) should date from around 1610 (http://www.theguardian.com/science/2015/mar/11/was-1610-the-beginning-of-a-new-human-epoch-anthropocene). This date was apparently chosen because this was the time at which a major transfer of species of animals and plants between the 'old' (Europe and Asia) and 'new' worlds (North and South America) started. I suppose it was when we became major factors in moving alien species between continents. The hope is that the era doesn't simply finish with strata of rocks containing the odd plastic bottle or iPad!
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