out of these which one of them is the greatest threat to our planet?
Global Warming & Climate Change
Is the Big Kahuna of all scenarios in which our presence on Earth is ended. Despite what the climate change deniers would have you believe, climate change is real. It is being caused by human beings, with a little help from lots of farting cows emitting methane, plus that giant well of methane lurking under the Arctic ice. As we burn carbon and increase our meat-eating ways, more and more greenhouse gas.
British physicist Stephen Hawking says aliens are out there, but it could be too dangerous for humans to interact with extra-terrestrial life.
Hawking claims in a new documentary titled "Into the Universe With Stephen Hawking" that intelligent alien life forms almost certainly exist — but warns that communicating with them could be "too risky."
"We only have to look at ourselves to see how intelligent life might develop into something we wouldn’t want to meet," Hawking said. "I imagine they might exist in massive ships ... having used up all the resources from their home planet. Such advanced aliens would perhaps become nomads, looking to conquer and colonize whatever planets they can reach.”
The 68-year-old scientist said a visit by extra-terrestrials to Earth might well be like Christopher Columbus arriving in the Americas, "which didn't turn out very well for the Native Americans." They introduced the small pox virus and most Native Americans died!
He speculated that most extra-terrestrial life would be similar to microbes, or small animals. Microbial life might exist far beneath the Martian surface, where liquid water is thought to trickle through the rock. Marine creatures might also conceivably live in huge oceans of water beneath a miles-thick layer of ice on Europa, a moon of Jupiter.
Recent films like Deep Impact and Armageddon have dramatized this human extinction scenario, an asteroid hitting the Earth. Hollywood is Hollywood, but in 2013, a real-life asteroid appeared without warning in Chelyabinsk, Russia. About 20 meters wide, it hurled into the Earth’s atmosphere at more than 40,000 miles per hour. Only the angle it came in at and its relatively small size prevented damage and destruction on a massive scale. But what would happen if a not-at-all uncommon mile-wide asteroid hit the Earth at this speed? Quite probably it would wipe out the human race.
The tremendous explosion it would cause upon impact would fling so much dust into the atmosphere that the sun would be completely blocked off, plant life and crops would die, severe acid rain would kill ocean life, and fiery debris would cause firestorms worldwide.
This has already happened at least once. The likely reason you don’t see any dinosaurs around the neighborhood is that they were wiped out by just such an incident. Donald Yeomans of NASA: “We expect an event of this type every million years on average.”
There are volcanoes, and then there are super-volcanoes. “Approximately every 50,000 years the Earth experiences a super-volcano. More than 1,000 square kilometers of land can be obliterated by pyroclastic ash flows, the surrounding continent is coated in ash and sulphur gases are injected into the atmosphere, making a thin veil of sulphuric acid all around the globe and reflecting back sunlight for years to come. Daytime becomes no brighter than a moonlit night.”
This lovely scenario is brought to us by Bill McGuire, director of the Benfield Hazard Research Center at University College London. About 74,000 years ago, the most powerful super-volcano eruption in human history occurred in Indonesia. It was close to the equator, and thus gases quickly passed into both hemispheres. Sunlight was blocked, and temperatures on Earth dropped worldwide for the next five to six years, below freezing even in the tropical regions. A super-volcano eruption is 12 times more likely than an asteroid hitting the Earth. Known super-volcanoes exist in Yellowstone National Park in the U.S. and Toba in Sumatra, Indonesia. And then there are the unknown ones…
Pandemic—An infectious disease that has spread through human populations across a large region—even worldwide
New diseases emerge every year. Some have the potential to devastate the population. In 1918, a strain of influenza spread worldwide and killed between 20 and 50 million people—more than were killed in all of World War I. In the past several years, diseases like SARS have come close to igniting into worldwide pandemics, and it is not at all inconceivable that, in our airplane-riding, interconnected world, some other virus could arrive on the scene with the virulence and transmissibility to decimate, if not destroy, the human population. “It is not in the interests of a virus to kill all of its hosts, so a virus is unlikely to wipe out the human race,” says Maria Zambon, a virologist with the Health Protection Agency Influenza Laboratory. “But it could cause a serious setback for a number of years. We can never be completely prepared for what nature will do: nature is the ultimate bioterrorist.”
In today world there are plenty of down-and-dirty, run-of-the-mill terrorists and the grand prize they all hope to get their hands on is a weapon of mass destruction like a nuclear bomb or a vial of smallpox virus. “Today’s society is more vulnerable to terrorism because it is easier for a malevolent group to get hold of the necessary materials, technology and expertise to make weapons of mass destruction,” says Paul Wilkinson, chairman of the advisory board for the Center for the Study of Terrorism and Political Violence at the University of St. Andrew.
“The most likely cause of large scale, mass-casualty terrorism right now is from a chemical or biological weapon. The large-scale release of something like anthrax, the smallpox virus, or the plague, would have a huge effect, and modern communications would quickly make it become a trans-national problem. There is a very high probability that a major attack will occur somewhere in the world, within our lifetimes.”
As for the nuclear threat, with increasing numbers of unstable countries like Pakistan and North Korea in possession of atomic weapons, the availability to terrorists seems only a matter of when and not if.
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Alright... Climate Change is the Greatest Threat , Followed by global warming and other threats.
What you need to know is the different topics the whole passage is about... The few topics from passage are
1) Climate Change
2) global warming...
Like this, collect all the topics.
these are all the topics:
Global Warming & Climate Change
What exactly is the question?
which is the highest threat and which is the lowest threat for the planet?
order and explain why
So, as you said, the topics are
Global Warming & Climate Change
Of these topics, I think we can sort one into the "not that big of a threat" sub-subject, and that is aliens.
Aliens may or may not be real, and though there is a lot of claims of their existence, no one knows for sure. This is not a large issue for the planet, since encounters of aliens have not been so vast, and they have not affected nations and large masses of people.
This is how the Global catastrophic risk is classified based on its effects.
1 Global pandemic(Warming)
2 Climate change
4 Terrorism and Pandemic
5 Geomagnetic reversal
6 Asteroid impact
7 Extraterrestrial invasion (Aliens)
.8 Cosmic threats
Now, on to Global Warming & Climate Change.
Global warming and climate change have both affected the entire Earth in many, many ways.
Due to the Earth getting hotter, a lot of polar problems have arisen.
Glaciers have been melting, and that has been causing sea levels to rise. Sea levels rising can become extremely dangerous, and they can cover entire land masses with water, basically drowning countries off the map!
This kind of problem affects millions of people - and land masses, so therefore, it can become a massive problem for the planet. I think this can go first in "greatest threats".
http://www.nrdc.org/globalwarming/fcons/fcons4.asp Also, here is a link about glacier melts for extra information.
@13ziar check the classification and rearrange the paragraphs, that's it, \(You′re~ Done~ !!\)
Now, asteroid impact.
The dinosaurs were wiped out by an asteroid, it wasn't the asteroid alone that killed them. The asteroid struck the Yucatan Peninsula and altered the weather. That was what killed the dinosaurs - global warming. But asteroids can seem quite dangerous due to that if their impact (and size) is big enough, they can alter the Earth's weather and possibly wipe out a large span of species.
But, asteroids are not the only disasters that can alter the Earth's weather.
Earthquakes can as well. The Japanese earthquake from 2011 and the Chile earthquake from 2010 both altered Earth's axis and shortened our days (by fractions, but it is still a big thing).
Asteroid impact CAN be a big problem, but asteroids are not hitting the earth all the time, so it isn't an awfully big problem.
Thanks for the help mates this was very helpful to me. i really appreciate your help.
Glad to help. If you need any more explanations, I'll try to provide them.
Before I go, though, here is a link for effects of supervolcanic eruptions :
what would be another equally important thing that threatens the planet? (climate change and global warming is done)