This document discusses urbanization trends, climate change challenges cities face, and opportunities for startups focused on improving cities. It introduces Urban.us, which invests in urban technology startups working in areas like transportation, infrastructure, energy, and public services. Urban.us' investment thesis is based on cities being at the forefront of solving global issues and some of the most valuable companies emerging from addressing city challenges. The document highlights several of Urban.us' portfolio companies developing technologies to help cities use energy more efficiently, enhance infrastructure and construction, and improve water management, transportation, and disaster response.