Hal Hirschfield is a psychologist who's been studying the question of how we think about ourselves in the future. When it comes to long-term decisions, what matters is the type of relationship we have with that future person. People who feel a greater sense of similarity and connection to their future selves are more likely to act ethically.
It may sound strange, but if you can learn to treat your future self like someone you really care about, then you'll be more likely to make satisfying, rewarding, and ethical long-term decisions.