The reading claims that dams are incredible engineering marvals that represent one of the most beneficial forms of electricity creation today and provides three reasons of support.

The reading claims that dams are incredible engineering marvals that represent one of the most beneficial forms of electricity creation today and provides three reasons of support. In contrast, the professor states that more research and development is necessary and construction of dams with their use poses many drawbacks. He refutes each of the author's reasons. First, the article asserts that dams positively impact the environment. However, the lecturer opposes this point by saying that envirnment does suffer. In fact, he mentions that during construction, water will be diverted which is a significant problem to the migration of fish. After construction, the water will return and the flow will be slow that hurts the reproductive of fish because they need fast flow to lay their eggs. Second, the reading posits that the power generated from a dam produces no harmful pollutants. On the other hand, the professor casts doubt on this point by explaining that dams contribute pollution. He adds that lakes which are created during costruction of dams flood periodically and this will affect on plants that will die because of that. Actually, he states that dead plants rot over time and methane, global warming gas, is released. Moreover, plants remove carbon dioxide, which another global warming gas, and dams cause release these gases and destroy plants that remove them. Third, the article avers that dams create no financial burden for the community. Conversely, the professor counters this point by stating that community does suffer. He argues that lakes flood periodically and the local residents who live there must be relocated because of flood, and this is not cheap. He says that this is economically unfeasible without government aid. This appears a contradiction to the information made in the passage.