What is the second stage of the life cycle assessment?

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How old is the earths atmosphere? What role did volcanoes play in the early development of earths atmosphere? What was likely the most common gas in the early years of earths atmosphere? How was the CO2 removed from the atmosphere? How where osion How where oceans formed? When did the earths atmosphere begin to look as it currently does? What is the most common gas in earths atmosphere? What is a greenhouse gas? what are examples of greenhouse gases? how many greenhouse gases are there? What are some of the human causes of greenhouse gasses? Why do we need some greenhouse gasses? How do greenhouse gasses effect the climate? What are the consequences of climate change? What is a carbon footprint? How are carbon footprints measured? What are some ways to decrease your carbon footprint? What is air pollution? What are some of the causes of air pollution? What is sedimentary rock? Give an example of a fossil fuel How does sulphur dioxide cause acid rain? 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What was the source of oxygen in the atmosphere? What natural resources are running out? How is chemistry improving sustainability? Why is recycling metals important? How is glass recycled? How is metal recycled? Why is it important to recycle glass? What is a life cycle assessment? Why are life cycle assessments used? What man made alternatives are being used to help reduce the use of natural resources? What raw material is used in making plastic ? What are the 4 stages of the life cycle assessment? What is the first stage of the life cycle assessment? What is the third stage of the life cycle assessment? What is the fourth stage of the life cycle assessment? What can we do to make soft drinks more sustainable? How is copper extracted from low grade ores? What is Potable water? What is the difference between potable water and pure water? How is water made potable? What must the PH levels of potable water be between? What is the minimum PH value for potable water? 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