On the 17th, Tonga submarine volcano was monitored to erupt again. Tonga volcano erupted three times in four days, bringing many effects: first, Tonga was seriously affected, and the capital was covered with volcanic ash, such as "the surface of the moon"; Second, the tsunami caused the capsizing of New Zealand ships, and the Tonga volcanic tsunami flooded the US seaport; Third, the volcano may collapse and further trigger a tsunami; Fourth, the volcanic eruption will not cause global temperature drop. Many experts said that the sulfur dioxide needed to cool the earth needs a "huge volume", and the early data of Tonga volcanic eruption show that its emission scale is too small to have any meaningful impact on climate change. (Xinhua News Agency)