Energy is generally defined as the ability to do work.
I. ACTIVITIES & CONDITIONS
A. Energy Uses
1. Direct use (fuel wood, direct heat, steam & related)
	2. Production of electricity 
	3. Internal combustion
	4. Distribution of transportation
II. SUSTAINABILITY PROBLEMS
A. Depletion of Non-renewable Resources
1. Proven and estimated global reserves
B. Pollution
1. Air
	2. Wastes
	3. Ecological/Ecosystem 
III. SCIENTIFIC & TECHNICAL SOLUTIONS
A. Alternative Production Technologies
1. Co-generation, improved efficiency in generation
	2. Improved location and extraction of resources
	3. Generation of choice - natural gas, clean coal tech
	4. Biomass
	5. Alternative fuels for vehicles, hybrid, electric
B. Efficient Use
1. Energy efficiency
	2. DSM
C. Pollution Control
1. Pre-combustion
	2. Post-combustion
D. Renewable Non-Polluting Resources
1. Solar
	2. Wind
	3. Geothermal
	4. Hydro
	5. Tidal
	6. Fuel cells
	7. Hydrogen
IV. SOCIAL, ECONOMIC, POLITICAL, & REGULATORY SOLUTIONS
A. Market Based Policies
1. Market driven changes in end-use
	2. Culturally driven changes in end-use
B. Direct Regulatory Control
1. Command & control (CAA, CAAA, EPACT)
	2. Government programs (DSM, LIHEAP, effstandards, CAFE)
C. Government R&D
1. Tax credits for renewables (PURPA)
	2. Technology transfer