Russia's invasion of Ukraine made Europe's energy dependence painfully clear. "We are supporting and actually financing the war by purchasing oil and gas and other fossil fuels from Russia," Finland's Prime Minister Sanna Marin bluntly put it.

Fossil fuel energy is vital for Russia's economy, accounting for almost half of its exports. One-third of Europe's oil and as much as 40% of natural gas imports come from Russia.

In this episode, we discuss how the war in Ukraine is changing the debate over fossil fuel dependency. Our guest is climate economist and Bloomberg News columnist Gernot Wagner of NYU and Columbia School of Business.