This news is not something new. But, why I wanted to take this up is that some people scorned Greta Thunberg, when she posted her lunch on train. They thought the train indirectly emits carbon dioxide, which she hates.
But, according to this news, Danish rail in electrified section is powered by wind energy.
Though I don't know if she was taking train in electrified section or not, the fact that
border between Denmark and Sweden is electrified makes it high possibility.