Climate change and high rates of extinctions of animals and plants are pushing the Earth into a danger zone for humanity, a scientific report card about mankind's impact on nature said on Thursday. An international team of 18 experts, expanding on a 2009 report about "planetary boundaries" for safe human use, also sounded the alarm about clearance of forests and pollution from nitrogen and phosphorus in fertilisers. "I don?t think we've broken the planet but we are creating a much more difficult world," Sarah Cornell, one of the authors at the Stockholm Resilience Centre which led the project as a guide to human exploitation of the Earth, told Reuters. "Four boundaries are assessed to have been crossed, placing humanity in a danger zone," a statement said of the study in the journal Science, pointing to climate change, species loss, land-use change and fertiliser pollution.

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