Tom atoe grows fruits and vegetables for home consumption. this activity is

I believe this activity is productive, however it is excluded from GDP because no market transaction occurs. The GDP is the monetary measure of the market value of all final goods and services produced in a period of time. The nominal GDP estimates are used to determine the economic performance of a whole country or region, and to make international comparisons. 

Well, both latitude and intensity of light affect temperature because, the higher the light intensity, the higher the temperature and since latitude is the measure of how close you are to the equator, then the closer to the equator you are, the higher the temperature is.