how do you think life on earth will end?

[ignoramus]

Spooks, is that a movie or a game? Seen it somewhere.

[brewer]

I'm going with complete and total lube depletion. The intense friction from all sources will cause the end of human life. I suggest you start hoarding right now. I'm going to start farming lampreys.

[Jenny A]

I don't know, except that it will involve climate. Eventually there will be no water and therefore no life here. Can't say I'm personally worried. It will be an unimaginably long time from now.

[AFTT47]

If you're talking about ALL life, that will happen when the sun gets too hot for the continuance of life - which will happen well before it reaches the red giant stage. There may only be a billion or billion and a half years years left before that happens. By that time however, human kind will have advanced to a state we probably cannot even imagine so that will not be an issue for our species. We will most likely have long since abandoned Earth anyway.

[Anomalocaris]

anyone else feel like the people who wrote the bible put in like a safety feature where they knew that someday people will realize it's all bullshit so they put in shit like "in the end times mankind will fall away  but you must hold on to your faith if you don't want to go to hell!!" - but how/do you think the world will ever end?

I seen a lot of things like global warming, over population and even the sun going to a red giant phase and scorching the earth - what do you think will most likely happen? I personally kinda always felt like mankind is its worst enemy and I heard lotta people say that as soon as even our grand children the earth may no longer be able to sustain life for humans because of pollution and damage to the ozone. A part of me kinda wants the earth to be destroyed cus some really fucked up things have happened on this place and I think it would be most beautiful for all life to cease and just have this giant ball of history just continuing its orbit around the sun indefinitely. 

also they say every star in the sky represents a solar system just like ours, do you think there is life on other planets out there somewhere? I kinda feel like odds are there is,  at the very least I would bet that single celled organisms exist somewhere out there.

The sun will burn up life on earth long before it goes red giant and engulf the earth.

The sun has been steadily brightening since 4.5 billion years ago. It will get much brighter still before it runs out hydrogen to fuse in its core and enter the helium burning phase to become a red giant.

Earth and its biosphere has coped with the gradual increase in solar brightness and heat out out by gradually reducing the greenhouse gases in the atmosphere. We may think we are putting a lot of greenhouse gases back into the atmosphere, but the total amount pales compare to what they were in the geological past. The truth is there is no a whole lot more greenhouse gas left in the atmosphere that can be removed to compensate for increasing solar output. As the sun heats up and brightens more, biosphere and geosphere will run out of more greenhouse gases to pull out the atmosphere to compensate. When that happens, a slow, inexorable, irreversible natural global warming will occur. Eventually That will trigger a vicious feed back cycle that will cause the oceans and the earth to regurgitate back into the atmosphere orders of magnitude more greenhouse gas than the atmosphere had ever contained before, leading to a runaway greenhouse effect, that will destroy all life on earth.

Estimates give life on earth another 500 million or so years. After that it's over. Life on earth has already ran 85% of its expected life expectancy.

[Rextos]

The sim will never end!
Kevin's got plenty of backups. The backups are automated.
You see, Kevin and his planet died off millions of years ago!

(Orchestra music hits crescendo- people shocked in the realisation)

this is scary because i often think to myself that my life is in a sim like the matrix or something and that i myself have died long ago and i live this life in an endless loop as a punishment for something...and seeing you post this really got me on that thought train again....but im gonna try to stop cus last time this got me in the hospital and almost jail time too lol...but it was very scary to see u type this and times like these make me wonder if shit like this is just a coincidence or if there is more to this world...

thanks for all the replies though guys, hey one thing i wanted to ask, i was chatting with a christian friend (he is a pretty cool guy tbh, very nice and helpful even though christian) but he brought up a pretty interesting point about evolution, he said basically if humans evolved from monkeys, then how come human  babies are so weak when they are born to 1-2 years they can't even walk properly where as most other animals including monkeys, giraffes, etc, can start moving around as soon as they plop out of their mom but humans need love and nurturing because we are creatures of love."  And that kinda blew my mind, why do u guys think that is? is it because evolution is not perfect and maybe in the future human babies will be able to walk around as soon as they are born? tbh i do feel like young girls these days that are like 12 years old are much more physically attractive compared to years ago.

[BrianSoddingBoru4]

I strongly suspect that life on earth will end by all of it dying.

I make no apologies for the prophetic radicalism of this notion.

Boru

[Hmmm?]

this is scary because i often think to myself that my life is in a sim like the matrix or something and that i myself have died long ago and i live this life in an endless loop as a punishment for something...

If it's an endless loop, then the end is just a beautiful new beginning... and instead of thinking of it as a punishment for something try thinking of it as a magnificent gift.

https://youtu.be/d-diB65scQU

[c172]

Another vote for greenhouse. I wonder how quickly. Heck, I wonder how humankind will be faring in 500 years.

[The Grand Nudger]

if humans evolved from monkeys, then how come human  babies are so weak when they are born to 1-2 years they can't even walk properly

A: we aren't evolved from monkeys - we're apes. B: What our children -are- good at is expensive, and comes at a cost, there is no free evolutionary lunch.

 maybe in the future human babies will be able to walk around as soon as they are born?

Possible, but unlikely.  Our heads are far to heavy and bulbous, and the amount of structural improvement alone required to support them would be a hell of a strain on the mother's ability to carry it and squeeze it out. We aren't the only species with relatively defenseless and immobile spawn, ofc. There are plenty of reasons for this, depending on the rep, and plenty of reasons within any given single rep. There's no single-line answer that covers it all.