It is still possible to maintain a high-yielding intensive agriculture despite increasing and serious environmental problems. n compared to in Western Europe. These advantages and derived advantages have allowed medieval China to lead the world in technology. Corgi A negative mind will never give you a positive life poster. The main technological innovations that China has been leading in so long are including cast iron, compasses, gunpowder, paper, printing and many other things that I have mentioned before. At the beginning of the 15th century China sent fleets to search for jewels, each consisting of hundreds of boats up to 400 feet long and a total of 28,000 crew members, across the Indian Ocean to the shore.