Apparently the Earth's orbit places us in the hot end of the inhabitable zone, so only a relatively modest increase in received energy makes us go the way of Venus.
Some of the research showed significant health improvements from 3 days a week of 3 reps of 20 second standing bike sprints. So only 3 minutes per week.
Also, all the non-MW interpretations say "and then choose a random outcome" without any clue as to how randomness might occur. MWI can propose an actual mechanism for randomness: sampling a space of alternatives, aka the Sleeping Beauty approach. To me this is pretty close to a knockdown argument in favour of MWI.