On history channel I watched recently a program regarding big disasters

plaguing our planet Earth. Human races been wiped out from Earth's face

by different cataclysmic scenarios such as asteroids, comets, gamma ray

bursts, and also after recalling all those movies portraying Earth on

the verge of extinction by deceases, asteroid impacts, atomic

disasters, and by the "danger of global warming". All these terrifying

and apocalyptic scenarios, have puzzled me, leaving me with many

questions:

All these "Mega Disasters" are, a real scenario on humans path

evolution? Meteors, comets, and asteroids can they really destroy human

civilizations the same way they wipe out the dinosaurs? Has humanity a

long overdue with fate, for a total cataclysmic disaster? And in the

end, can humanity survive and recover from it? I'll try to summarize

all my answers in one block.

Asteroids, comets, prophets of doom.

Hundreds of thousands of asteroids have been discovered within the

solar system every month. The Earth has gone through periods of abrupt

and catastrophic change, some due to the impact of large asteroids and

comets on the planet. Until recently dinosaurs were considered to have

died off gradually. The recent discovery of the impact from a large

asteroid or comet on the Yucatan peninsula, had scientists think its

size and timing make it, the culprit that would explain the demise of

the dinosaurs. Earth been plagued by such events since is creation, is

well known. So that in the end humanity is indeed, steering on the path

of such cataclysmic scenarios in the near future. Can we avoid it? That

depends on our technology.

Gamma ray bursts.

Gamma ray bursts, something which I learned from the history channel.

From many disasters impelling on us, this one seems that has came out

from a science fiction movie, but the threat is real, even if it has a

very low probability to ever happened is another threat to add in the

cataclysmic events list. And if "I hope in the most far future

possible" this will ever happen, there is any chance of survival? No,

there is none! Supernova'gamma-ray bursts announce the demise of the

most massive stars in the universe, and hypothetically if Earth was on

any of these path, for our world would be the end.

Contagious diseases.

Avian Infectious Diseases, is another emerging infectious disease,

which threats humanity survival. Many are concerned that the Bird flu

virus will mutate and trigger a human pandemic. Will this decease

spreading world-wide like a fire, cause human populations to decline

dramatically, or all together end human civilization as we know?

Contagious diseases like the bubonic plague which spread in Europe in

the 1347s, and causing after five years, 25 million of dead people

"one-third of Europe's population". There were three major epidemics -

in the 6th, 14th, and 17th centuries, the total death toll was 137

million victims. These diseases can take their toll of human lives, but

in the end we'll survive them.

Atomic disasters.

Atomic disasters such as nuclear melt-downs, or a nuclear wars.Right

now, looks like the big players on the "nuclear war" contest, have

realized the impossibility to win an atomic war, and "wishfully" they

are refraining themselves from ever actuate this threat.

Global warming.

Adding one more at the list is global warming. Global warming is not

the least of all threats to be dismissed. I believe global warming is

one serious threat to be reckoned with in the near future, and dealing

with it in time, may be one solution.

All these disasters or near disasters will in the end have an impact in

the human evolution and history for sure. We can deal with some of them

right now, by modifying our own behaviors, others are in God's hands.