【正确答案】Despite limited farmland (cultivated land/arable land), China has solved the problem with food and shelter. However, excessive (excess) use of (chemical) fertilizers has led to the inefficiency of farmland and severe (serious) pollution. 40 percent more fertilizers are used in Northern China than are required by crops. China's grain output (production) accounts for 24 percent of the world total, but fertilizers used make up 35 percent of the global total consumption. The government is to (should) take action to reverse this situation.