[ WP ] Write a story set in the past with an antagonist from the future

Sequoias stood like pillars, holding the forest canopy high towards the azur sky. Majestically towering above the soil-bound inhabitants, they sheltered the tribesmen from the falling rain. The sequoias were beautiful. Strong. They would remain long after man had left this world. 
 
 The forest floor was painted in soft ferns and colorful herbs. The carpet of greenery healed the afflictions and cured the woes of the few tribes people who lived among it. As the men tended their fires, curing the spoils of the hunt, the women cultivated the many plants that made their home around the camp. Though they pulled out quite a few, the tribeswomen knew: the plants would remain long after men had left this world. 
 
 Not to far away, the children played under the sun. The sunshine glimmering off the waves and splashes caused by their fun. Flowing east to west, the river spread life throughout the ever expanding forest. The tribes people fished and drank from the fresh source and they would do so for many many years to come. Its pure refreshment would remain long after man had left this world. 
 

