Urban Doughnut is rated 3 out of 5 in the category design for built environment wholesomeness. Read and write reviews about Urban Doughnut. Sustainability Strategist Pte Ltd is an independent Southeast Asian sustainability consultancy based on the philosophy of the Urban Doughnut. Supporting the built environment sector in its sustainable transition, we empower urban designers, architects, engineers and contractors to fulfill their larger purpose in addressing our global crises. We intelligently apply sustainable design principles gleaned from Northern Europe - to create solutions to suit our enigmatic, diverse local contexts in Southeast Asia.