grethel aguilar | scienceinfo.net

New analysis finds more than a third of tree species are at risk of extinction
The world's trees are under serious threat, with large numbers of species on the brink of extinction, according to a new global analysis.
Ocean exhausted oxygen at record level, alarming a series of 'dead zones'
Experts warn the ocean has lost its unprecedented levels of oxygen as a result of climate change and intensive human activity.