It's hard to find a more perfect guest for the end-of-the-year podcast than the former president of Estonia, Mrs Kersti Kaljulaid. She's a global advocate and recognized thought leader on a wide range of topics, including (cyber) security, artificial intelligence, mental health, and the well-being of women and children. But this conversation focuses on green transition, greentech and, as Mrs Kaljulaid put it so nicely - why this "little lab of digital development" called Estonia is still lagging in green innovation.