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finite meaning
it will run out, fossil fuels
renewable meaning
can be used more than once, crops used to make biofuels
why are LCAs used
to assess the environmental impact of the thing
how do they found out the environmental impact
analyse the stages of the life cycle from extracting and processing raw material to its end including transport
how does recycling metals help
it saves energy and the finite metals, pollution caused by mining and extraction of metals reduced