space traveler plants trees in alien worlds, reversing dystopia with greenery

space traveler trees alien worlds dystopia greenery planting reversing arboreal intergalactic horticulture planet restoration terraforming environment ecology astrobiology sustainability extraterrestrial vegetation botany flora universe regeneration biodiversity astrotravel conservation lifeforms spaceship rejuvenation replenishment greenthumb repopulation horticulturalist galaxies planetary biomes ecologist bioplanet spaceman cosmos abundance ecosystem revival galaxy foliage seedlings mars venus