Because the land area of Holland14 is reclaimed from the sea, it has promoted its agricultural development, but it has also had a negative impact on the natural ecology. Therefore, in order to protect the environment, the Dutch Ministry of Agriculture has also promulgated this 30-year plan, the important purpose of which is to protect endangered animals and plants and establish a water-locked wetland from south to north. Therefore, "returning farmland to the sea" is not a literal meaning, but a slogan to protect nature.

Because of the lack of strength, at first, because many countries opposed the Spanish Empire, the Netherlands got great help and achieved independence and success. The shipbuilding industry developed rapidly, acquired many colonies and conducted a lot of trade. After that, other countries began to counter the Netherlands, which led to the decline of its strength.