The world faces the nightmare possibility of fishless oceans by 2050 unless fishing fleets are slashed and stocks allowed to recover, UN experts warned Monday.

“If the various estimates we have received… come true, then we are in the situation where 40 years down the line we, effectively, are out of fish,” Pavan Sukhdev, head of the UN Environment Program’s green economy initiative, told journalists in New York.

The world’s biodiversity is threatened by the economic growth of countries like China, India and Brazil, the study will say.

While Western countries are increasingly aware of the need to protect endangered species, the developing world’s appetite for raw materials is destroying vulnerable ecosystems, the report’s authors will warn.

Population growth, pollution and the spread of Western-style consumption are also blamed for hitting plant and animal populations.

Abandon any notion of surviving the apocalypse by doing anything as boringly obvious as running for the highest hill, or eating cockroaches. The American firm Vivos is now offering you the chance to meet global catastrophe (caused by terrorism, tsunami, earthquake, volcano, pole shift, Iran, “social anarchy”, solar flare – a staggering list of potential world-murderers are considered) in style.

Vivos is building 20 underground “assurance of life” resorts across the US, capable of sustaining up to 4,000 people for a year when the earth no longer can. The cost? A little over £32,000 a head, plus a demeaning-sounding screening test that determines whether you are able to offer meaningful contribution to the continuation of the human race.

If the course of human history is any model, then the wheels are already turning on Earth’s sixth mass extinction, thanks to habitat destruction, pollution and now global warming, a scientific analysis of millions of years of data revealed Friday.

That means North American mammals are well on the way - perhaps as much as half way - to a level of extinction comparable to other epic die-offs, like the one that wiped out the dinosaurs.

Governments must act urgently to halt loss of habitats and invading species that are posing major threats to biodiversity and causing species extinctions across Australia, New Zealand and the Pacific Islands, according to a landmark new study.

“Earth is experiencing its sixth great extinction event and the new report reveals that this threat is advancing on six major fronts,” says the report’s lead author, Professor Richard Kingsford of the University of New South Wales.”