Third Sphere is an early-stage climate fund that concentrates 80% of its portfolio in hardware-enabled solutions while most VCs avoid hardware, building specialized playbooks for funding physical systems and pioneering climate resilience beyond just carbon reduction. The firm operationalizes a "Seedstrapping" model that combines $250k-$1m investments with AI-driven efficiency and alternative financing to help hardware companies reach $1m ARR or $10m in pre-orders within six months, making traditional growth VC optional.