Most people underestimate just how much waste a single project can produce — from excess concrete and broken tiles to plastic wrappings and timber scraps. Studies show that construction and demolition contribute to nearly one-third of global waste. That’s a staggering number when you think about it.Most people underestimate just how much waste a single project can produce — from excess concrete and broken tiles to plastic wrappings and timber scraps. Studies show that construction and demolition contribute to nearly one-third of global waste. That’s a staggering number when you think about it.