interfere with some subsistence and commercial fisheries.block the range of many aquatic species, including migratory fish and river dolphins.Hydropower is now used to meet Brazil’s growing demand for energy, but many dams are being constructed in areas of high conservation value. For example, building new roads exposes previously inaccessible areas of forest to illegal and unsustainable logging as well as illegal or unplanned settlements and agricultural expansion. Transportation and energy infrastructure are essential for national and regional development, but when they are poorly planned, negative impacts can exceed short-term benefits.