STEP 19:
Build Proof of Concept

Once climate and energy startups have some resources at their disposal, they will likely be able to build some version of the solution, though it will be much smaller than the version they will sell at scale, with far higher costs per unit output. The aim at this stage should be to prove technological viability rather than business viability, but if they can sell the end product, even in small quantities, that will be quite helpful.