They already destroyed all of their forest natural resources a long time ago. Maybe they are trying to warn north america of their own mistakes.
Ireland has the climate to support the entire island covered in Atlantic rain-forests. People already agree Ireland is a pretty country, can you imagine how glorious it would be to have rolling hills covered in trees.
There's also the case of the near-loss of the American Chestnut.
source: current graduate research papers in forestry
https://joint-research-centre.ec.europa.eu/jrc-news-and-upda...
As for central Europe, yes they need to reforest their own countries before they go flying all around the world screaming about the Amazon, while drinking the finest champagne.