as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
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create an outline for an essay about renewable energy.
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i. introduction 
a. definition of renewable energy 
b. examples of renewable energy sources
ii. benefits 
a. economical advantages 
b. environmental advantages 
iii. challenges 
a. cost of energy storage
b. intermittency of sources 
iv. conclusion 
a. renewable energy is the future 
b. taking action to transition to renewable energy
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