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...restrial life]]form.<ref name=telegraph20100410/> The actual odds of these scenarios occurring are difficult if not impossible to deduce.<ref name=bostrom2002/> ...moving westward from Africa and Europe. Researchers have produced several scenarios about how this will continue in the future.{{sfn|Ward|2006|pp=231–32}} Thes ...

...it by this time, sending the inner Solar System into chaos. Other possible scenarios include Mercury colliding with the Sun, being ejected from the Solar System ...Marc |last3=Weinberg, Nevin N. |year=2003 |title=Phantom Energy and Cosmic Doomsday |journal=Physical Review Letters |volume=91 |issue=7 |pages=071301 |arxiv=a ...

...ited Nations Department of Economic and Social Affairs}}</ref> Alternative scenarios for 2050 range from a low of 7.4&nbsp;billion to a high of more than 10.6&n ...m a population decline to 3.2&nbsp;billion in the "low scenario", to "high scenarios" of 24.8&nbsp;billion.<ref name=WorldPopProspects/> One extreme scenario pr ...