By Ben Aris in Berlin Six out of the nine “planetary boundaries” that track how close humanity is coming to environmental disaster had already been crossed by the end of 2023. And in July scientists said there may be a tenth: the oceans are running out of oxygen. The idea of boundaries was first proposed by the climatologist Johan Rockström. A team of 28 renowned scientists then defined a set of nine planetary boundaries – processes essential for maintaining a stable climate suitable for human life – in 2009 to set a benchmark for measuring the unfolding Climate Crisis. When the original repor…