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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outline the main points of a speech on green energy.
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1. introduction to green energy: definition, overview, and benefits 
2. types of green energy: solar energy, wind energy, geothermal, and hydropower
3. renewable energy technologies: carbon capture and sequestration, wave power, tidal power and ocean thermal energy conversion
4. current and future uses: grid power, battery storage systems, transportation, heating and cooling systems
5. key challenges of green energy: cost, dependence on weather conditions, effects on the environment
6. policy considerations for green energy: subsidies and incentives, carbon taxation, grid innovations
7. conclusion: go green, save the planet
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