One evening, Nikola Tesla was sitting in his laboratory, the hum of his inventions surrounding him. His mind was lost in thoughts about time and space, pondering the mysteries of the universe.

Suddenly, a spark of inspiration hit him. What if time wasn't linear? Could it be possible to travel through time, just as one travels through space? A thrill washed over him, his heart pounded with excitement at the mere thought.

Tesla decided to transform this idea into reality. Days turned into weeks, weeks into months, but Tesla was relentless. The room was filled with gears, wires, blueprints, and a massive machine in the center.

The machine was a magnificent structure, built to defy the norms of time. Finally, after years of hard work, Tesla stood in front of his completed time machine. His palms perspired and his heart raced, as he was about to test it.

With a deep breath, Tesla powered up the machine. It hummed to life, and a vibrant green portal materialized in its center. Plucking up his courage, Tesla stepped through the portal.

Instantly, Tesla found himself in the hustle and bustle of a city much more advanced than his own. He marveled at the futuristic vehicles zooming past him, the towering skyscrapers, and the digital billboards.

He soon learned that he had landed in the year 2020. Everywhere he went, people were engrossed in small, sleek devices they held in their hands. He realized these were the successors of his invention, the telephone.

Intrigued by the modern world, Tesla started exploring. He noticed that electricity, his life's work, had become the lifeblood of this era. It powered everything, from small gadgets to entire cities.

Despite the marvels of this new world, Tesla noticed one thing that deeply troubled him. He saw grey skies, polluted rivers, and trash-filled streets. The beautiful planet he knew was wilting under the onslaught of human activity.

This realization hit Tesla hard. He knew he had to do something to change the course of this future. He decided to use his knowledge to set the world on a path of sustainable progress.

Using his genius intellect, Tesla started working on revolutionary ideas. He designed advanced renewable energy solutions, eco-friendly transport, and waste management systems that could bring a drastic change in safeguarding the planet.

Despite the initial struggles, Tesla started gaining recognition for his innovative ideas. He collaborated with scientists and philosophers, spreading his vision for a sustainable future. His work started inspiring changes around the world.

Although Tesla was making significant strides in changing the future, he was still a stranger in this time. He yearned for home, for his own era where he truly belonged. He decided it was time to return to his world.

As he activated his time machine once more, a sense of accomplishment washed over him. He felt that he had played his part in trying to save the future. With a hopeful heart, Tesla stepped into the portal once again.

Tesla found himself back in his laboratory. He looked around, everything as he had left it, save for a thin layer of dust that had settled over everything. He had returned to his own time, but he was changed.

His journey through time had taught him the true cost of progress. He realized that the path of development should not outstrip the pace of sustainability. His experiences in the future shaped his inventions in a more environmentally friendly direction.

Tesla knew his actions in the future would not change the past but it had given him a new perspective on his work. His vision had broadened and his mission had become clearer. Now, he was driven by a renewed purpose: to guide humanity towards a sustainable future.

In the following years, Tesla's work gained a new direction. His inventions were rooted in sustainability, aiming to harmonize human progress with nature. His message reached out to the world, influencing other scientists and inventors of his time.

Today, we remember Tesla not just as a pioneering inventor, but also as a visionary who realized the importance of balancing progress with environmental preservation. His journey teaches us the value of sustainable development and the role each of us can play towards a better future for our planet.

Tesla’s time traveling adventure may have been a fantasy, but his message of sustainability is one that still resonates today. His story reminds us that we too, in our own ways, can strive to be time travellers who shape a better future.