I focus on transformative changes to how and why we use energy. The constraints climate places on our fossil fuel use are fundamental and absolute, so I seek opportunities to utterly break our reliance on them through zero net energy buildings, renewable energy sources, wisely sited and scaled energy storage, efficient plug loads, and electric transportation options. In practice, this means finding alternatives to energy efficiency business as usual -- new ways of measuring and specifying product energy consumption and performance, promoting and incentivizing the best performers, and ensuring products operate as efficiently as intended. It also means recommending bidirectionally charged EVs in lieu of dedicated stationary storage in most cases, because the economics and storage capacity are more compelling.I'm increasingly active in the clean tech and biotech investing fields as well. It's a distinct twist on socially responsible investing that advocates not merely for avoiding the stocks of coal, oil and tobacco companies, but diligently seeking out those companies that are innovating and deploying the most revolutionary solutions. Most of what passes for ESG investing today involves passive screens for the most egregiously bad activities and products, and yields largely similar portfolios full of MSFT, AAPL, AMZN and other large cap companies that only devote a modest portion of their business activities to solving climate change. I'm more interested in the companies that exist solely to solve that problem, and who may not yet be on the radar of most investors.