Longtermism is the view that what matters most about our actions is their impact over the long-term future.

When judging the value of an action, future considerations may be highly relevant. Ethical theories according to which future people are moral patients, whose wellbeing is of comparable importance to the wellbeing of present-day people, imply that we ought to consider the long-term future of humanity, rather than just the next hundred years or so.

In fact, since it is possible that nearly everyone who will ever live has not yet been born, these ethical theories tend to imply that if there is anything that can be done to positively shape the long-term future, then this will be more valuable than any other possible action....

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