Rising concentrations of gases may have more serious impacts than previously believed,a major scientific report has said.There is only a small chance of green house gas emissions being kept below dangerous levels.
Greenland ice is likely to melt,leading sea levels to to rise seven meters over 1000 years
"The thing that is perhaps not so familiar to members ofthe public ... is this notion that we could come to a tipping point where change could be reversible"
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