1) The document discusses how adopting lean project delivery practices can help address issues like climate change, waste, and cost overruns in the building industry. 2) It cites Toyota's use of lean to develop the highly profitable Prius hybrid car and argues a similar approach could help deliver high-performance green buildings on time and on budget. 3) The document proposes converting the $500 billion in annual waste in construction into making all new buildings net-zero by 2020, arguing that lean practices could make net-zero buildings economically viable.