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Ecosia plants 200 million trees
(blog.ecosia.org)
This is a most excellent place for technology news and articles.
Ecosia doesn't sell carbon credits though.
They might buy them though to inflate the number of protected trees. I'm not saying they are, just providing a potential reason for such a large number
My understanding from reading their posts is that the counter only counts planted trees. Other things like building solar panels and fight deforestation are not even counted like that. That's why they said they are phasing out the individual tree counter, because it doesn't account for all those other things.