阅读下列短文，根据短文内容填空。写在未给提示词的空白处仅填写1个适当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。Can a sixth extinction be avoided? 【小题1】 (expert) say that it is not yet too late, if we take action now. This would mean we have to significantly change the way we live. For example, we need to take steps to save endangered species, including setting up special areas 【小题2】 plants and animals can be protected. We need to change how we work and travel by using 【小题3】 (clean), more natural sources of energy. We also need to improve our farming methods to reduce water, air and land pollution. In short, we need to stop destroying the planet that we live 【小题4】 and start to protect it.
