<span>http://teachingresources.atlas.illinois.edu/chinatrade/introduction04.html</span>
Answer:
The golden door is a beacon of promise beckoning immigrants to embrace a new land and all it offers. Another meaning of the golden door is that anything worthwhile is worth fighting and working hard for, and gold is emblematic of something of worth.
During the Middle Ages farming was the basis of society. Every one of the feudal system - the lord, servants, and retainers - was supported by the income that came from farming. So the exploration of land was extremely important which caused a huge environmental impact.
The problem was that in that time there was no agricultural improvement, they did not know how to enrich the soil or how to do the proper rotation of crops, they used the system that cultivated 2/3 of the land and let the other third to rest. This caused a series of impacts such as climate changes, deforestation, and soil erosion.
