I read the thread and maybe I missed it, but...
The end of the Earth? Hmmmm... only celestial/solar or geological/geothermal cataclysm.
No other power (even nukes on steroids) could do it. The Earth is simply TOO BIG. There are certain laws in nature that cannot be superseded. While the supersonic rush of sub-freezing air masses swirling in from space makes an interesting global-war(n)ming theatrical ("The Day after Tomorrow" movie) it is physically (think: physics) impossible. First off, since space is a vacuum no force on earth could be strong enough to invoke a terrestial atmospheric low pressure that could override that of space. Also, the laws that govern the movement of gases states that the temperature of an air mass will change in proportion to the speed of the movement. Specifically, the faster the air mass would descend from near space (no "air" in space) the faster it would warm up to match the surrounding environment. You get the idea. In regard to global warming the same types of laws apply. While it might have an effect that effect would naturally be limited to its max and then would wane. Sure, it might be a rough ride, but it would return to equillibrium. It couldn't be the end.
The end of humanity? Barring the above, it would seem impossible as no human-induced phenomena could reach every possible remnant. The actions of humans against humans can not go beyond a "critical mass." In the aftermath there is a reduced human presence; therefore, a reduced threat. The fewer the possibilities the fewer the results. While disasters on a national scale will come so will the reduction of potential as well. It all stays in balance.
So, when will it all come to an end?
The short answer is,
"... when the last second,
of the last minute,
of the last hour,
of the last day,
of the last week,
of the last month,
of the last year,
of the last decade,
of the last century,
of the last millenia,
of the last eon...
... runs out.
Poll
