I envision a future where the deceased are buried in eco-friendly ways that would allow the nutrients to go back to nature. Currently, the burial practices are either damaging to the soils (embalming), or to the atmosphere (cremation). Despite the existence of alternatives that offer greener solutions, cultural taboos surrounding the topic of death prevents us from adopting newer practices.
And so any interventions that aim towards the future I envision would naturally involve changing the societal values regarding death. For example, increasing public awareness about the ecological harms that current burial processes can bring is definitely a valid solution. But even more importantly, the society as a whole should become more open towards talking about death itself. This can partly be encouraged through changing the default organ donations to be donors: having people becoming more aware of what happens to them after their death may facilitate better discussions about the topic.