The document outlines several potential existential risks to life on Earth, including climate change leading to biodiversity loss and extinction, changes in sea levels and currents disrupting marine and terrestrial ecosystems, an asteroid or comet impact disturbing food chains and causing environmental damage, hydrogen sulfide emissions from bacteria poisoning life on land and sea, a nearby gamma ray burst destroying the ozone layer and exposing the planet to solar radiation, a geomagnetic reversal weakening the magnetic field and exposing Earth to solar winds, and diseases or epidemics spreading more widely as climate and landscapes change and organisms lose defenses.

2. Climate Change
• Alternate heating and cooling of Earth
• The Biodiversity of Earth and cannot
keep up with the rapid changes of
temperature and climate, that may lead
to the extinction of animals.

3. Changes in Sea Level or
Currents
• It is the rising and lower of the sea
level
• It has a huge impact on marine life
• It could disrupt weather patterns that
could affect terrestrial life

4. Asteroid or Comet Impact
• An impact from an enormous asteroid or
comet could disrupt the food chains
• It also produces dust and other particles
that could prohibit photosynthesis
• It could also cause earthquakes, mega-
tsunamis and forest fires

5. Hydrogen Sulfide Emission
• Hydrogen Sulfide – A colorless, flammable
and poisonous gas used in paper and pulp
industries
• It can be caused by deep-water sulfade
bacteria
• Can poison life on both land and sea

6. Gamma Ray Burst
• A nearby gamma-ray burst that is 6000
light years away can affect Earth
• It is powerful enough to destroy the ozone
layer of the Earth
• It would expose the Earth from the sun’s
ultraviolet radiation

7. Geomagnetic Reversal
• It is the magnetic reversal of the Earth’s
magnetic field
• It can weaken the Earth’s magnetic field
• It can expose the Earth from the solar
winds coming from the sun
• It can result to a disastrous drop of oxygen
on Earth

8. Disease or Epidemic
• With the changing of the climate and the
landscape, organisms are losing the ability
to defend itself from harmful diseases or
epidemic
• They can be now affected by the diseases
• This can lead to their own extinction