For a moment put aside the impracticality of trying to forecast anything for 20 years, and listen to BP’s chief economist Spencer Dale explain some trends in energy and economics. Keeping an eye on big trends in industry and the fuels it’s powered by is important for anyone considering where to invest going forward. Even though it’s impossible to get it all right over a 20 year period, BP does an admirable job trying. You too should focus on the long-term. Executing an investment plan based on big, long-term trends will beat the short-term, earnings-focused, Wall St.-alarmist strategy of speculation .