David Miller is a venture capital investor at Clean Energy Ventures who went from being a startup founder and Lucent New Ventures director to earning a PhD in Engineering Systems focused on clean energy ventures, and he created the Simple Emissions Reduction Calculator (SERC) that CEV uses to estimate whether technologies can mitigate at least 2.5 gigatons of CO₂e by 2050. He requires every prospective portfolio company to show a credible path to mitigating 2.5 gigatons of greenhouse gas emissions by 2050 and co-designed one of the first suburban net-zero homes that was featured on "This Old House" as a model proving net-zero living doesn't require lifestyle sacrifice. David Miller is a venture capital investor at Clean Energy Ventures who went from being a startup founder and Lucent New Ventures director to earning a PhD in Engineering Systems focused on clean energy ventures, and he created the Simple Emissions Reduction Calculator (SERC) that CEV uses to estimate whether technologies can mitigate at least 2.5 gigatons of CO₂e by 2050. He requires every prospective portfolio company to show a credible path to mitigating 2.5 gigatons of greenhouse gas emissions by 2050 and co-designed one of the first suburban net-zero homes that was featured on "This Old House" as a model proving net-zero living doesn't require lifestyle sacrifice.