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Both the author in the reading passage and the lecturer in the lecture talk about the causes of Little Ice Age. Yet their viewpoints contrast with each other. While the author mentions three possible reasons for the Little Ice Age's coming, which are the disruption of the ocean currents, the eruption of volcanoes and the substantial decreases in human population, the lecturer thinks otherwise, contending that those reasons are out of date and they are not able to account for the result.

First of all, while the writer states that the cooling may have been caused by disrupting of ocean currents, the speaker presents opposing discourse to such a belief, reasoning that the disruption of ocean currents only occurred in Europe and North America, since it just happened in part of the world, it is not able to be explained as a cause of the Little Ice Age.

Second, as opposed to the conviction presented in the reading passage, the speaker argues that if there were a large amount of dust erupted from the volcanoes, there might have found some records about the striking visual changes caused by the volcano eruption, such as the difference of the color of the sunset or the snow becoming grey.

Third, presented by the lecturer to diminish the authenticity in the reading passage is the argument that there was no enough time to cool the earth with the huge decline of human population. The lecturer states that when the human population increased, the forests would decrease due to the agriculture purpose. Once the forest decreased, it become warmer. Therefore it was not long enough to make the earth cool.

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