Purely academically speaking, “Zukunftsschutz” lacks precision: “Longtermism is the view that positively influencing the longterm future is a key moral priority of our time.”
Someone believing in longtermism may want to engage in “Zukunftsschutz”, but the latter seems to be downstream from the former (a moral stance vs. an activity)
Not every believer in longtermism may want to engage in “Zukunfsschutz”, not every “Zukunfsschützer” may believe in longtermism.
Adding to your general point:
Purely academically speaking, “Zukunftsschutz” lacks precision: “Longtermism is the view that positively influencing the longterm future is a key moral priority of our time.”
Someone believing in longtermism may want to engage in “Zukunftsschutz”, but the latter seems to be downstream from the former (a moral stance vs. an activity)
Not every believer in longtermism may want to engage in “Zukunfsschutz”, not every “Zukunfsschützer” may believe in longtermism.