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B. Stable civilization held together by some unforeseen social science or social philosophy,

(4) Disease or Catastrophic Pandemic

B. Transfer of ourselves to an artificial form, capable of surviving independent of our planet and sun.
A. Interstellar Travel, maintaining our present physical form or biologically similar.

Transcendence is a low-probability set of scenarios in which we acquire a form of civilization which can outlive our planet and any set of catastrophes which would eventually destroy us. This highly desirable future can take many forms, but all have several characteristics in common. All must be highly stable, but cannot be static or without ability to adapt and evolve. All must eventually take us away from a solar system which has a long but finite future. And any possible future in this category must allow us to develope a much higher state of mind and intelligence.
A. Repetitious Rises and Falls
a path to Highway 3 is found).

Following is an outline of all the possible futures I can envision and a few of their subsets.
Highway 1: Extinction (Highly unlikely, but becoming more probable over great lengths of time unless we find our way to Highway 3).
(3) Change in Solar Output, resulting in an uninhabitable Earth.
(1) Climate Change Has to be catastrophically extreme to achieve total extinction.
(3) Man-Made Illness
B. Extinction Through Man-Made Event

v class="googleright">There are three primary highways our future can take and an infinite number of detours possible along each path. The greatest number of these possibilities are just a repetition of our past, with enumerable rises and falls along the way (the higher the rise the harder the fall), spanning into the distant future. In this grouping of possibilities the present level of our civilization would be nothing more than a blip in history, receding in importance with the passage of time, probably acquiring the status of legend and myth, as did the Roman Empire throughout the subsequent dark ages.
(2) Nuclear Holocaust

but falling short of the third highway.
Highway 3: Transcendence (Highly desirable)

(1) Human-Induced Climate Change Once again this would have to be extreme.
(2) Impact by asteroid or comet

Then there is the much smaller set of possibilities in which homo sapiens become extinct. As much as this scenario is predicted and discussed among doomsdayers, the fact is we are a hard lot to kill. All it takes is a small pool of humans to survive and repopulate the gene pool. It is probable that in past ice ages our numbers dwindled dangerously low at times,[link widoczny dla zalogowanych], but each time the ice receded and the archaeological evidence becomes rich with human expansion and development. It is important to emphasize, however,[link widoczny dla zalogowanych], that when greater and greater lengths of time are considered, this remote possibility increases,[link widoczny dla zalogowanych], until it reaches a point in the distant future when it becomes an absolute certainty. The only way to escape the certainty of our racial mortality is to move into the third highway of possible futures, transcendence.
C. Evolution, either natural or artificial,[link widoczny dla zalogowanych], into a higher biological form able to

A. Extinction by Natural Event

(4) Unforeseeable Catastrophic technology
Highway 2: Status Quo (This will inevitably deadend at Highway 1 given enough time, unless
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