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3 1 $begingroup$ I'm discussing climate change with a friend who is a climate change denier, basically the argument is that looking at this graph, is not clear that something unusual is going on, so the sea level rise is just something that was there, all natural not caused by human activity. Could you please explain this ? climate-change sea-level share | improve this question edited 46 mins ago Camilo Rada 9,345 3 29 67 asked 1 hour ago Samuraka Samuraka