We may see this world as countries, cities, towns, and people that are divided by lines on a map. But the truth is that this is one world that arose within space, and that will dissolve back into space. And that every being's body that has ever habited this world is actually made up of it, and will dissolve back into it. Nothing exists independently.
It is impossible to live in this world without affecting the environment and others around you.
Whatever arises from your body, speech and mind will affect things. And you alone are in charge of what kind of effect that you would like it to be. Do not underestimate the far-reaching effects of your actions. This brings you enormous responsibility.
Therefore, be very careful and compassionate with your body, speech and mind. As a stone dropped into water will cause a ripple to move outwards in all directions, continuing on long after that stone left the hand. Likewise, a single action can cause a ripple effect within the interconnectedness throughout this world and beyond, continuing on long after that action was carried out or forgotten.
So l urge you, for your own, and others' benefit, please look after this fragile world for the very short time that you are on it, and leave it for the next generation in a way that you would like to find it. And become a responsible samsaric traveller, wherever you are, while you are in samsara. Continue to do this, and your positive karma will support you in your Buddhist path to freedom.