NUCLEAR  WAR

 A nuclear detonation from one of today’s more powerful weapons would cause a fatality rate of 80 to 95 percent in the blast zone stretching out to a radius of 4 kilometers — although “severe damage” could reach six times as far.

Biological and chemical warfare

Biological weapons represent a greater catastrophic threat. Advances in synthetic biology have made very real the possibility of malicious actors creating harmful pathogens for weaponization — or innocent researchers accidentally releasing a lethal infectious bug out into the world

Catastrophic climate change

Ecological  collapse refers to a situation where an ecosystem suffers a drastic, possibly permanent, loss of capacity for all organisms, often resulting in mass extinctions.

Ecological  collapse

new evidence is emerging on “ecosystem collapse” due to among other factors, human pressure, and climate impact.

Asteroid impact

Asteroids are rocks that revolve around the sun and that occasionally collide with the Earth. An asteroid large enough to cause a global catastrophe hits Earth every 120,000 years, scientists estimate

Supervolcanic 

 eruption

A supervolcanic explosion 74,000 years ago ejected so much debris into the atmosphere that scientists believe it caused the Earth to cool by several degrees Celsius. Some experts believe this caused the greatest mass plant and animal extinction in human history, bringing the species to the brink of extinction.

Pandemics

Twice in modern history, plagues have swept across the world, killing an estimated 15 percent of the population in a few decades. They occurred way back in the fifth and 14th centuries, respectively — but there is a serious risk

Solar geoengineering

Solar geoengineering would reflect light and heat away from Earth and back into space by injecting aerosols into the stratosphere, the second layer of Earth’s atmosphere. For now.

Solar geoengineering would reflect light and heat away from Earth and back into space by injecting aerosols into the stratosphere, the second layer of Earth’s atmosphere. For now.

It only exists in computer models, but the first experiment is being planned by Harvard researchers.

Solar geoengineering

Artificial intelligence

There’s a common misconception that the risk of AI is that it will become malevolent. The bigger concern is that it will become too good at its job. “If you ask an obedient, intelligent car to take you to the airport as fast as possible, it might get you there chased by helicopters and covered in vomit, doing not what you wanted but literally what you asked for.

Unknown risks

It wasn’t that long ago that climate change and nuclear warfare were largely unheard of. Today, they’re risks we’ve already seen the devastating effects of — and that we worry could get much worse. Because of this, there’s a possibility that we haven’t even conceived of what is most likely to kill us.

 Is it Nearby,

Are We Safe.?

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