TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Methods: The method also comprises organizing and implementing quality assurance mechanism program for supervising the manufacture of the solar cooker/solar electricity generator; earning accruing emission credits tradable emission rights/credits, thus substituting carbon containing fuels by sunlight for cooking, water heating, and/or electricity generation; keeping record of cooking and/or electricity generating operation on sunlight and submitting the record at regular intervals to designated entity for emission credits; offering or selling earned accrued emission credits or tradable emission rights/credits to willing buyer; gathering accumulating amassing the multitude of earned emission credits or right by an entity. Preferred Properties: The height of the mirror is equal or 10 times greater than the width of the first window. The first window has width equal or 3 times greater than the width of the second window. The dimension in vertical direction of the half-barrel shaped concave reflective cavity is one half-3 times the width of the first window. The rail or guide rail plate possess bendable mirror compression profile for exerting no compression for mirror in flat shape and/or for exerting mirror compressions greater than or equal to relationship stating that the bendable mirror compression is equal to quotient of differences of 90degrees and mirror tilt angle, and sine of the difference of 90degrees and mirror tilt angle minus 1 multiplied by mirror height. The radius of the mirror curvature is equal to the quotient of the difference mirror height and mirror compression and twice the sine of the difference of 90degrees and mirror tilt angle. The plate has dimension fitting a cooker cavity. Preferred Components: The mirror comprises air channel or air chimney for enhancing cooling air draft for cooling photovoltaic cell module under the mirror. The conducting tray is metal alloy plate, glass plate, or polymer plate. The metal alloy comprises chromium, nickel, molybdenum, titanium, manganese, aluminum, copper, tin, zinc, and/or carbon. The metal alloy plate is coated with selective coating, non-selective coating, black paint, or non-stick coating, e.g. fluorocarbon polymer coating, e.g. Teflon. The metal alloy can also be stainless steel alloy coated on the surface(s).