家用燃料变迁过程的示意图如图：
（1）2020年，受新冠疫情的影响，全球工业生产排放的温室气体比2019年 （填“上升”或“下降”）。
（2）秸秆在隔绝空气的条件下受热分解生成H2、CH4和CO等气体，则秸秆中一定含有的元素有 ；煤炭燃烧时排放出NO2、等气体，在空气中会形成酸雨。
（3）由液化石油气（主要成分为C3H8）改为压缩天然气（主要成分为CH4）时，燃气报警器应安装在灶具的 （填“上方”或“下方”）；写出CH4完全燃烧的化学方程式：。
（4）为实现我国“2030年前碳达峰，2060年前碳中和”的目标，你认为能源综合利用的趋势是 。
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