【小题1】It is our dduty (责任，义务) to try to cut back on production and reduce the amount of things we make and buy.
【小题2】Trees aabsorb (吸收) the carbon dioxide in the air to produce oxygen.
【小题3】People have harmed nature through aagriculture (农业), fishing, hunting and tourism.
【小题4】Many countries have hesitated to give ppermission (准许，许可) for the production of GM foods, as they would rather be cautious with this new technology.
【小题5】I feel really gguilty (内疚的) because I made some cruel remarks too.
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解析：
【小题1】考查固定句型。It is one’s duty to do sth.“做某事是没人的责任”。故填duty。
【小题2】考查单词拼写。absorb“吸收”。故填absorb。
【小题3】考查单词拼写。agriculture“农业”，是名词。故填agriculture。
【小题4】考查单词拼写。permit“允许”，是动词，名词是permission。故填permission。
【小题5】考查系表结构。feel是系动词，后跟形容词作表语。guilty“内疚的”。故填guilty。