Impacts of Large Dams

The video discusses the environmental impacts of large dams, focusing on ecological disruption, sedimentation, and the effects on species and human communities. Large dams block ecological continuity, cause methane emissions, and affect flora and fauna. They also lead to sedimentation, nutrient loss, and potential species extinction. Human communities, especially indigenous peoples, face displacement and loss of resources. The video concludes that large dams are unsustainable and highlights the need for alternatives and ecosystem rehabilitation.

What is the minimum height for a dam to be classified as a large dam?

• 20 meters

• 15 meters

• 25 meters

• 10 meters

What percentage of the global river volume is impacted by fragmentation due to large dams?

• 50%

• 40%

• 30%

• 20%

What greenhouse gas is emitted due to the inundation of forests by large dams?

• Sulfur dioxide

• Nitrous oxide

• Methane

• Carbon dioxide

How do large dams affect the downstream areas of rivers?

• No change in water supply

• Decrease water supply

• Increase sediment flow

• Increase water supply

Which species are particularly at risk due to the disruption of migration by large dams?

• Reptiles

• Amphibians

• Migratory fish

• Migratory birds

What is a significant consequence of sedimentation caused by large dams?

• Loss of valuable nutrients downstream

• Increased fish population

• Improved water quality

• Enhanced plant growth

How do large dams contribute to climate change?

• By increasing methane emissions

• By reducing carbon emissions

• By promoting wind energy

• By enhancing solar energy

What is a major reason for the unsustainability of large dams?

• They enhance biodiversity

• They are cost-effective

• They cause loss of ecological integrity

• They improve water quality

What is a proposed solution to the problems caused by large dams?

• Building more dams

• Rehabilitating degraded ecosystems

• Increasing dam height

• Reducing dam width

What is a key impact of large dams on indigenous people?

• Increased economic opportunities

• Improved living conditions

• Enhanced cultural preservation

• Loss of ancestral domains