Why the world is watching Brazil's election

As Brazilians prepare to pick Jair Bolsonaro or slot Luiz Inácio Lula da Silva as their new president, the future of the largest rainforest in the world hangs in the balance.

There is no such thing as silence in the Amazon. The rustle of the trees, the birdsong, the drips of water on leaves after a heavy downpour - the forest is always talking.

But then every so often, it is rudely interrupted; nature's conversation drowned out by the hum of planes or helicopters overhead.

Most of the aircraft belong to illegal gold miners, heading to sites to deliver supplies. The people of Maloca Paapiu hardly bat an eyelid now. And they feel that the authorities are doing the same.