Third Sphere is a Brooklyn, New York early-stage climate fund investing at pre-seed and seed to upgrade broken global systems across infrastructure and supply chains. Roughly 80% of its portfolio is in hardware-enabled solutions spanning energy, food, water, waste, transportation and resilience. The firm has backed over 100 companies aimed at GHG reduction and resilience.
Focus and check size from the firm's website. Website reachable as of Oct 2026.
A fit check scores your pitch against their thesis, stage and ticket. An email draft uses their real deals and thesis, not a template.