Earlier quoted context omitted.
Not all Hindus cremate their dead. In fact a small minority do. In South India, burials are what you will see in nearly all the cases. Only a certain castes cremate. Everybody else buries and yes river burial too is not common. Lets talk of reckless dumping of human waste, industrial waste into rivers and lakes.
As a non-religious athiest hindu this is the first time I am hearing this, could you give some pointers. I would have expected it to go the other way (if at all), that is, only a small minority of hindu's do not cremate their dead.
In South India, we very rarely cremate.
Every village has a big "Rudrabhoomi". Cremation is a very upper caste thing.