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Both the reading and the lecture mention tidal power. While the passage points out lots of advantages of tidal power, the speaker casts doubt on this idea by giving evidences about the flaws of this kind of power.
First, the professor claims that tidal power can never supply enough energy to produce electricity that can satisfy the total needs of people. However, in some specific cases, it can satisfy the demand for energy at local level. This refutes the point of view made in the material that nowadays, technology is available to convert tidal power into electricity power, which can be a substitute for fossil fuel some day. In the other words, it can serve the vast demand for energy of human beings.
Second, in the lecture, the speaker stands on the side that tidal power and the process of converting it into electricity energy may have a negative effect on the environment. Particularly, this will change the quality of water, which can lead to more serious impacts such as changing the local wildlife or even destroying the current creatures. More seriously, this can lead to the decline of the local economy because people who live with fishing career now cannot navigate to the sea any more. All these things seem to cast doubt on the claims made in the reading which backs up the view that tidal power has much positive influence on the environment such as providing renewable, environmental - friendly source of power for human beings