justify the statement 'forest has no waste
This is true that forest has no waste because all the waste produced in the forest is biodegradable like dead plants and animals and droppings of animals and birds, so they are decomposed by microorganisms and mixed with soil.
Also, forests lack the main cause of waste material generation, Humans. There is no human population living in the forests, so there are no wastes in the forests.
Also, forests lack the main cause of waste material generation, Humans. There is no human population living in the forests, so there are no wastes in the forests.