This report documents that more compact mixed use urban development patterns as advocated by New Urbanism play a pivotal role in addressing climate change, as sprawling, car-dependent cities significantly contribute to greenhouse gas emissions from transportation. Compact, mixed-use, and transit-oriented development can reduce vehicle miles traveled by 20–40%, leading to substantial emissions reductions while offering co-benefits such as improved public health, reduced infrastructure costs, and land conservation. Achieving these outcomes requires coordinated policy changes, including zoning reforms, investments in transit infrastructure, and incentives for smart growth, emphasizing the need for collaborative efforts among developers, planners, and policymakers to create sustainable and climate-friendly urban environments.