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Hi Sultan,
LEAP is not inherently suited to conducting life-cycle energy, cost or emissions analyses, but this is not to say that with some legwork, you couldn't incorporate the principles of these assessments into your LEAP model. This would entail deciding upon the life-cycle flows outside of LEAP, and then simply entering those into the model as you would any cost or emissions factor. But this is not really what LEAP is designed to do, and to be clear, LEAP does not estimate what these additional life-cycle flows may be.
Without knowing exactly what kind of modeling you hope to conduct, I can only suggest a list of broad options - it will be up to you to determine if any of these tools or databases meet you needs. Have a look at the following:
From National Renewable Energy Lab in the US - a database of life-cycle emission and energy for US products:
https://www.lcacommons.gov/nrel/search
For software, I can think of two tools that are intended to help with sectoral LCAs:
For buildings: http://www1.eere.energy.gov/femp/information/download_blcc.html
For transportation: http://greet.es.anl.gov/
For something a little more multipurpose: http://www.ghgprotocol.org/Third-Party-Databases/GEMIS
It's not much to get started, but I hope I've answered your question!
Taylor