What is the first stage of the life cycle assessment?

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Why did the presence of oxygen allow more complex organisms to evolve? 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 second 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 potable water? What is the difference between potable water and pure water? How is water made potable? 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