|Abstract||In this century a number of events could extinguish
humanity. The probability of these events may be very low, but
the expected value of preventing them could be high, as it
represents the value of all future human lives. We review the
challenges to studying human extinction risks and, by way of
example, estimate the cost effectiveness of preventing
extinction-level asteroid impacts| |Keywords||No keywords
specified (fix it)| |Categories||No categories specified (fix
it)| |Through your library||Only published papers are available
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