答案解析:

1.答案: (that) more nuclear power plants (should) be removed/abolished

詳解:
考查虛擬語氣: 動詞proposed后的賓語從句中要求用虛擬語氣，其形式為: 謂語動詞原形或should+動詞原形。
"廢除更多的核電站"是賓語從句，作動詞proposed的賓語, that可省略。
考查詞匯的表達: "核電站"譯為nudear power plant; "廢除"可用remove, 也可用abolish.
核電站是"廢除"的承受者，用被動語態。

2. 答案: has increased by 20 percent compared with that

詳解:
考查倍數的増減:英語當中常用increase，go up，rise, grow…或decrease， reduce, drop, fall, decline等詞表示"增或減"。后跟by表示"增減了多少"，to表 示"增減到多少"。
考查固定搭配: "與……相比"的表達為compared with…
with之后是比較的對象，常用代詞that指代上文提過的output。