New roads divide up parts of the rainforest and can cut off connections between different biotic and abiotic systems. For example, a road can stop monkeys such as the golden lion tamarin from travelling to gather food and, in turn, distribute seeds to re-sow plants in the forest.
Land clearance for farming, transportation and mining can lead to deforestation. Hardwood trees take many years to grow so can be difficult to replace.
Fertile soils that make farming possible are quickly washed away when the forest is cleared. If soil ends up in rivers, this can lead to flooding.
Loss of animal habitat occurs when trees are cut down. Hence, deforestation can result in endangering animals and plant life, or even causing them to become extinct.
Profits from large-scale farming and selling resources often go back to MEDCs or large companies and don't benefit the rainforest communities.
Large scale deforestation has taken place in the Amazon