Tyre is one of the sites most at risk from coastal erosion.
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The ancient ruins of south Lebanon's Tyre are among the UNESCO World Heritage sites most threatened by rising sea levels, researchers warned Tuesday.Recent studies taking into account shrinking ice sheets, now the top contributor to sea level rise suggest those earlier projections were far too conservative.Even under the most optimistic scenarios for reducing greenhouse gases, sea levels will continue to rise well into or across the 22nd century.Researchers led by Lena Reimann of Kiel University looked at four climate change scenarios based on how quickly and deeply humanity reduces carbon pollution.They ranged from one that would see global warming capped at 2 degrees Celsius above preindustrial levels, to a "business-as-usual" trajectory in which greenhouse gas emissions continue unabated, resulting in a temperature increase of 3 to 4 degrees Celsius by 2100 .
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