Why is it necessary to encourage a low carbon lifestyle?

Why is it necessary to encourage a low carbon lifestyle? do you think it is necessary to have rules at schllo?why? if it is necessary /if necessary /when it is necessary 意思一样吗 Is it necessary to teach children about sex,why?麻烦帮帮忙想想关于这个题目的英文口语,不需要太长,2分种的口语就好!Is it necessary to teach children about sex and marriage,why? Critisism is necessary ( ) it helps us to find mistakes and correct them.A.in thatB.in whichchoose?why? It's not necessary ____ the same.A、be B、is C、 to be D、being选什么?Why? Do you think it is necessary to say No sometimes?Why的英语作文,高一的,简单一点.急! when it is necessary 为什么可以变为when necessary? why it is 还是why is it it is necessary for you to work Is it necessary to learn grammer It is necessary for sb to early 是什么副词It is certainly necessary! It is necessary to do 的例句 net realisable value 与cost的关系?请问下,why is it necessary to value the inventory at the lower cost and net realisable vaule 请用英语回答.Why is it necessary to transfer the nucleus of a somatic cell to the enucleated egg during the cloning process? i feel it necessary 的句子成分分析下为啥不是 it is necessary 关于necessary.it is necessary to do sth.it is nec关于necessary. it is necessary to do sth. it is necessary to doing sth. 两者有什么区别?什么时候用to do .什么时候用 to doing?请回答,