Over the last decade, the area protected for nature in Australia has shot up by almost half. Our national reserve system now covers 20% of the country. That’s a positive step for the thousands of species teetering on the edge of extinction. But it’s only a step.

Western Sydney University researchers have contributed to a world-first study that estimates there are 73,000 tree species on Earth, including about 9,200 species yet to be discovered, of which 1,500 species are likely to be concentrated in northeast Australia and the Pacific Islands.