The Amazon Basin is a sparsely populated region of Brazil.. Unfavourable climate, heavy rainfall, inaccessibility and dense forest are the barriers for development of human settlements and industrialisation here.
On the other hand, the Ganga Plain region is one of the most densely populated regions of India.
Due to flat fertile plains, availability of water, suitable climate, dense human settlements have been established in this region.
Mining activities in the Amazon Basin causes pollution in the Amazon River, whereas industrial and domestic sewage adds to the pollution of River Ganga. Thus as compared to Amazon, the pollution in River Ganga affects human life greatly, as the Ganga Plain is more densely populated as compared to the Amazon Plains.