The World's Memorial Day special is focusing on energy. Much of the world is working to wean itself off of Russian energy in the short-term, which in some cases means building up new fossil fuel infrastructure to secure supplies from different countries. At the same time, countries are struggling to reduce greenhouse gas emissions, but falling behind on climate targets. Which raises a question: Will the move away from Russian energy speed up the development of renewable energy sources, or lock-in dependency on fossil fuels for longer? Also, since Russia’s invasion of Ukraine this year, many European countries are refocusing their energy independence efforts to nuclear power. And, here’s what we largely know how to decarbonize, and what we don't — yet.