How will the world end?

Slowly consume istelf until there is no life, then no land, then no earth.

Just a star that glow for maybe someone else.

I would say with the sun engulfing us, or we will destroy it with war.

our earth: very sure through us, our sun system, when our sun turns off and the universe has a deadline, too, maybe (String theory etc.)

climate change of course but we will not see so dont worry

watch the movie 2012 and it will all make sense

The earth will probably be consumed by the sun at some point. We'll be long gone by then, having made the planet inhospitable to humans.

they say the world wont go out with a bang but with a wimper, sad really isnt it?

probably by fuking nuclear wars

I think it will end when everyone will not have the thing necessary to live so it will start a big war on the planet

realistically probably a man-made disaster that crashes the grid