A 50-year study shows trees in Australia's tropical rainforests are experiencing chronic stress, and mortality rates began climbing in the 1970s.| www.abc.net.au
Recent research finds large swathes of the Amazon are releasing more carbon dioxide into the atmosphere than they are absorbing, in a worrying sign that the planet's greatest carbon sink could turn into a carbon producer, hindering efforts to slow global warming.| www.abc.net.au