In The Beginning of the End for Life as We Know it on Planet Earth? author Paul Watson asks if there is a way for humanity to survive on this planet. Excerpts:

. . . Today, escalating human populations have vastly exceeded global carrying capacity and now produce massive quantities of solid, liquid, and gaseous waste. Biological diversity is being threatened by over-exploitation, toxic pollution, agricultural mono-culture, invasive species, competition, habitat destruction, urban sprawl, oceanic acidification, ozone depletion, global warming, and climate change. It’s a runaway train of ecological calamities. It’s a train that carries all the earth’s species as unwilling passengers with humans as the manically insane engineers unwilling to use the brake pedal. The latest reports from the International Union for the Conservation of Nature’s Red List (IUCN) – a database measuring the global status of Earth's 1.5 million scientifically named species – states quite confidently that we will lose half of them by 2150.... ....Species work interdependently to develop mutually beneficial strategies that maintain and strengthen ecosystems. Every species removed diminishes the system and weakens the collective body of the biosphere. Humans are presently acting upon this body in the same manner as an invasive virus with the result that we are eroding the ecological immune system. A virus kills its host and that is exactly what we are doing with our planet’s life support system. We are killing our host the planet Earth. I was once severely criticized for describing human beings as being the “AIDS of the Earth.” I make no apologies for that statement. Our viral like behaviour can be terminal both to the present biosphere and ourselves. We are both the pathogen and the vector. But we also have the capability of being the anti-virus if only we can recognize the symptoms and address the disease with effective measures of control. John Muir once wrote that when you tug on any part of nature, you find that it is intimately connected to every other part of nature. The symptoms are right here before our eyes. Bee diminishment is causing diminishment in plants dependent upon bee pollination. Army ants support 100 known and identified species from beetles to birds. Grey whales are returning to Mexican lagoons under-nourished. Shark and large predatory fish populations have been reduced to between 65 to 95 percent in our oceans. Entire fish species are in a state of rapid collapse, especially the commercially valued species like cod, wild salmon, swordfish, and tuna...

There's a lot more food for thought in this article. Some critics of the author claim that he's asking for the mass extermination of 5 billion humans. That's a warped, gross mischaracterization of the autor's intent, which is to point out the interactions of the planet's ecosystems and the damaging effect on it by humans.