Just came across this amazing paper that lists Embodied Energy (the amount of energy required to manufacture something) for various materials.
The paper is from the UK, where resource and energy limitations and the global warming effects of excess CO2 are topics that are discussed openly.
INVENTORY OF CARBON AND ENERGY (ICE)
The web site where this document originally came from is here.
Summary Tables Only
Here is a spreadsheet version (XLS) for download & consideration.
If the metric units are a barrier,
here is a slice rule calculator tool to assist.
Best,
-AC