This episode highlights the change this planet would go through if people disappeared. What would happen if humans stop controlling the planet or influencing the plants? Nature will find its way through. The world would flourish, there would be more trees and new species of flora and fauna would be exposed. There would be no pollution and the trees which were cut down would find its way back and grow amidst the concrete jungle and the food chain would go back to how it used to be. There are pros and cons of this particular possibility.
To know more, watch this interesting video and discover new aspects of this hypothetical scenario.