I'm thinking of dumping waste on the beach.
I would not suggest such a thing. Why do you want to dump waste on the beach?
Yes, I don't see it as a problem since we can easily create a cleaner and better place elsewhere.
You have a lot of waste to dump and chose the beach, but this will make marine life suffer. Dumping waste in it's proper places is going to be beneficial for all, so take the time to do your research and find an eco-friendly solution. Marine life will die off if you don't and this will be bad for the ecosystem.
I really don't care about beaches so I will dump all I want. The mountains are where I want to live.
The whole world is one big ecological system and you can't dump waste on the beach and then expect that eventually it won't filter into the mountains in the future. Start thinking of the planet as one big ecosystem and then you won't want to dump waste anywhere.