Lena Thiede co-founded Planet A Ventures with an in-house team of scientists who have veto power over investments—if they determine a startup won't create net positive environmental impact through quantitative assessments like life-cycle analyses, the firm won't invest regardless of commercial potential. She has institutionalized this scientific impact assessment as a true gating criterion that redefines fiduciary duty in climate-tech venture capital, using planetary boundaries as a framework to guide investments toward moving key systems back within safe operating space.