阅读下面短文，根据短文内容填空。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。

COP26, 【小题1】 (know) as “Conferences of the Parties”, was the latest in a series of meetings bringing together governments 【小题2】 (protect) the environment. Its main goal was 【小题3】(take) measures against climate change — long-term changes in world weather patterns that are linked to human activities including farming, industry and transport. Gases such as carbon dioxide, which are produced by these activities, trap heat in Earth’s atmosphere and cause temperatures to rise, 【小题4】 (lead) to extreme floods, heatwaves and storms.