Humans are responsible for having wiped out nearly half of the trees on earth, according to new research co-authored by a Kiwi scientist.
A study just published in the major journal Nature estimated deforestation was presently responsible for removing over 15 billion trees each year and the global number of trees has dropped 46 per cent since human civilisation.
The researchers were however also able to calculate that there are more than three trillion trees in the world - about eight times higher than previous estimates - and this equated to about 422 trees-per-person in the world, not 61 as originally thought.
The study, led by researchers from 15 countries, used satellite imagery, forest inventories and supercomputer technologies to generate a map of the world's forests.
More than 420,000 ground-sourced measurements of tree density from 50 countries and every continent, except Antarctica, were used - previous estimates relied solely on satellite imagery.