Third Derivative, founded in 2020, is an accelerator firm based in Boulder, Colorado that provides an 18-month-long accelerator program for climate-tech startups operating in sectors such as energy, hard science, hardware, and software sectors. A collaboration between RMI and New Energy Nexus, Third Derivative (D3) is a vertically integrated engine built to accelerate the rate of climate innovation globally. They combine a next-generation accelerator, committed venture capital, a curated ecosystem of global corporations, and unparalleled market, regulatory, and policy insights to provide startups tackling hard climate challenges with access to funding, corporate partners, and policymakers. Their mission is to find, fund, hone, and scale the most-promising technologies to achieve larger, faster reductions in global carbon emissions, while also recognizing the economic opportunity that comes with addressing the climate crisis.