The best text structures for your essay about global warming and the various attempts to fight it would be:
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Compare and Contrast - This structure would allow you to examine the similarities and differences between the various methods used by countries and activist groups to combat global warming.
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Problem and Solution - This structure would help you outline the specific aspects of global warming that each attempt aims to address, presenting the problem and discussing the solutions proposed or implemented by different entities.
These structures will effectively support your focus on the diverse approaches and their effectiveness in addressing the issue of global warming.