【命题示例】材料一:有专家指出,全球温室气体排放量与日俱增,主要是近百年来发达国家工业化进程的结果。材料二:目前、发达国家仍是温室气体的主要排放者,其中美国名列第一,在全球二氧化碳排放量中占到四分之一,但美国政府拒绝执行旨在减少全球温室气体排放量的《京都议定书》。据此回答下列问题。 [Proposition example] Material One: Some experts pointed out that the global greenhouse gas emissions are increasing, mainly the result of industrialization in developed countries in the past century. Material II: At present, the developed countries are still the major emitters of greenhouse gases. Among them, the United States ranks first, accounting for one-fourth of the global carbon dioxide emissions. However, the U.S. government refuses to implement policies aimed at reducing global greenhouse gas emissions “Kyoto Protocol”. Answer the following questions accordingly