What type of essay is this, primarily?

B

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Yes! You are correct.

Paragraph 1: Climate change impacts pose a global threat since a report carried out by the IPCC (Intergovernmental Panel on Climate Change) warns that global warming may be irreversible. The importance of renewable energy solutions in mitigating climate change has been proven: the actual dependence on fossil fuel energy sources highly contributes to global greenhouse gas emissions, the leading cause of global warming.  

Paragraph 2: However, such alternative energy sources, because of their intermittency, (in the sense that, for instance, the wind doesn't always blow nor does the sun always shine) can’t be that efficient. Therefore, world leaders should join efforts to set up enhanced environmental policies so as to tackle global warming consequences.