The report added that now only a quarter of land on this planet has not been severely impacted or damaged by human activity, but is projected to decline to just one tenth of the land by 2050, due to pollution, disease, and climate change, among other factors.
The report says that half of the world's shallow-water corals have been wiped out over the last 30 years; ivory poaching has reduced the elephant population in Tanzania by more than 60 percent between 2009 and 2014, and 100,000 orangutans in Borneo died between 1999 and 2015 due to deforestation.
On Earth the number of animals since 1970 decreased by 60%. Tropical areas have experienced the worst declines, with an 89 per cent fall in populations monitored in Latin America and the Caribbean since 1970.
"Our life style is Smoking like a Chain, and binge drinking at the expense of the planet", said Jörg-Andreas Krüger from the WWF to the twelfth edition of the for the first time 20 years ago, published Reports.
The report, which comes out every two years, presents a sobering picture of the impact of human activity on the world's wildlife, forests, oceans, rivers and climate. "We're monitoring more populations (16,704), more species (4,005), and the trend remains the same". Freshwater species have also suffered greatly, declining 83 percent over the same period.
With the world set to review progress on sustainable development and conserving biodiversity under United Nations agreements by 2020, there is a window of opportunity for action in the next two years, the conservation group argues. It urged for a new, global agreement between governments, businesses, research and civil society to seize the opportunity and ramp up momentum. "Shrinking wildlife numbers are an indicator of the tremendous impact and pressure that we are exerting on the planet", Marco Lambertini WWF International director general said in a media statement.
"Our wanton destruction of nature, coupled with the brutal chaos of climate change, is the biggest threat to humanity". It makes a case for urgent need for the global community to take stock and "collectively rethink and redefine how we value, protect and restore nature". "There can not be a healthy, happy, and prosperous future for people on a planet with a destabilized climate, depleted oceans and rivers, degraded land, and empty forests, all stripped of biodiversity, the web of life that sustains us all". "We are going to need your help to achieve it", said Prof.
If that's not enough, four so-called planetary boundaries have already been pushed beyond safe limits: climate change, biosphere integrity, biogeochemical flows (nitrogen and phosphorus) and land-system change.
The authors are setting their sights on 2020, when leaders are expected to review progress made in global treaties like the Paris Agreement and the Convention on Biological Diversity.
Equally worrying: more than two thirds of the world's wildlife could be gone by 2020 if current trends continue. Researchers from the Global Footprint Network cite an increased biocapacity-an ecosystem's ability for self-renewal- of "about 27% in the past 50 years" as one reason not to buy your ticket to Mars today.
The population of the critically endangered "gharial" across its range in India and Nepal declined by approximately 58 per cent between 1997 and 2006, the report states.