source of electrical energy source of electrical power source of electricity source of embarrassment source of emissions source of emotional source of employment source of encouragement source of energy source of enrichment source of entertainment source of environmental source of error source of errors source of essential source of everything source of evidence source of evil source of expertise source of exposure source of external source of fascination source of fat source of fear source of fiber source of fibre source of finance source of financial source of financing source of fire source of fluid source of fluoride source of food source of foreign source of foreign direct source of foreign exchange source of free source of free radicals source of fresh source of fresh water source of friction source of frustration source of fuel source of fun source of funding source of funds source of future source of gas source of global source of good source of government source of grace source of great source of great concern source of great pride source of greenhouse gas emissions source of growth source of guidance source of happiness source of healing source of health source of healthy source of heat source of heating source of help source of high source of high-quality source of hope source of hydrogen source of identity source of ignition source of illumination source of imports source of income source of infection source of influence source of info source of information source of insecurity source of inspiration source of inspiration for me source of instability source of intelligence source of interference source of investment source of iron source of irritation source of it source of job source of jobs source of joy source of knowledge source of labour source of law source of lead source of learning source of legal source of legislation source of legitimacy