Hi! I read this article today [http://www.independent.co.uk/news/business/news/unilever-plastic-sachets-recycle-stop-enter-ocean-creasolv-process-billions-cosmetics-food-products-a7728396.html] and there are several statistics mentioned such as "64 million tonnes of trash produced per year and 1.3 million tonnes end up in the ocean." Just curious how researchers were able to quantify  such amounts. In general, are there common models used to extrapolate these data? How would the sampling of this be done? 

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