The two text structures that would best fit your essay about global warming and the various ways countries and activist groups have attempted to fight it are:
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Compare and Contrast - This structure will allow you to discuss the similarities and differences between the various attempts made by different countries and activist groups.
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Problem and Solution - This structure will help you outline the specific parts of the global warming issue and how each attempt aims to address these problems.
Using these two structures will enable you to effectively convey the complexities of the issue and the diverse approaches taken to combat it.