That is the stark warning contained in the latest edition of WWF's Living Planet Report, the leading statement of the planet's health. It shows that species and wildlife continue to decline, and around 50 countries are slipping into a state of permanent or seasonal water stress.
The report, produced with the Zoological Society of London and the Global Footprint Network, shows that American and United Arab Emirates citizens have the biggest impact on the planet and Malawi and Afghanistan citizens have the smallest.
The UK comes in 15th, having the same ecological footprint as 33 African countries put together, with the average UK resident's impact on the planet being more than three and a half times that of the average African.
More than three quarters of the world's people are now living in nations that are ecological debtors, where national consumption has outstripped their country's capacity to produce natural resources and capture carbon emissions.
"Most of us are propping up our current lifestyles, and our economic growth, by drawing - and increasingly overdrawing - on the ecological capital of other parts of the world," James Leape, director general of WWF International, said.
"If our demands on the planet continue to increase at the same rate, by the mid-2030s we would need the equivalent of two planets to maintain our lifestyles."
The report, which is published every two years, shows that carbon emissions from fossil fuel use and land disturbance are the greatest component of humanity's footprint, underlining the key threat of climate change.
