A vibrant steampunk carnival set in an eco-conscious future, where Victorian-era circus performers are powered by renewable energy, their mechanical limbs adorned with intricate clockwork designs that whir softly as they perform breathtaking aerial acrobatics beneath a canopy of bioluminescent vines. The air is filled with steam and the joyful sound of solar-powered calliopes. In the background, Art Nouveau architecture merges seamlessly with ultra-modern glass domes housing lush vertical gardens, as children with holographic popcorn and families wearing retro-futuristic attire marvel at robotic animals that mimic the grandeur of extinct wildlife, creating an enchanting blend of nostalgia and sustainability.