Identifying Organizational Structure in Argumentation

Read the following excerpt from a persuasive essay on renewable energy:

"Transitioning to renewable energy sources is essential for a sustainable future. First, these sources can reduce our dependence on fossil fuels. Additionally, they help in mitigating climate change by lowering carbon emissions. Finally, embracing renewable energy can lead to job creation in innovative industries."

In this excerpt, the author organizes their argument primarily through a specific method. Which organizational structure does the author employ?