The Primary Footprint is a measure of our direct emissions of carbon dioxide from the burning of fossil fuels including domestic energy consumption.We have direct control on these.
The Secondary Footprint is a measure of the indirect carbon dioxide emissions from the whole life cycle of products we use - those associated with their manufacture and eventual breakdown.
Global warming hence is really the result of our unwise & unchecked fiddling with our natural resources. In all our consumption behavior our guiding principle should be 4R's --- Recycle, Reduce, Reuse and Recover.
Hence if your footprint is as big as that of Hulk, few quick ways to reduce your personal footprint to as small as that of Stuart Little, are to employ eco - friendly methods to travel , follow environment friendly diets, minimize use of plastic & save electricity & water.