Esperanto is still eurocentric. That is, it is only easy to learn because you already know English, and perhaps another European language. Lojban or toki pona would be a better option.

Wtf supporting environmental causes is extremist now?

Centrists are so balanced, just like the upvote/downvote ratio of this post. It also has 4 comments at the time I wrote this.

BookWyrm is a secondary source, so I don’t think it’s a good idea. Personally, I’d link to:

• The book’s website, if there is (which usually just links to amazon)
• Wikipedia page
• OpenLibrary

As for where to buy books, I’ve recently heard of Libreture, which have DRM-free books (see other DRM-free book source), though its database might be lacking because it’s rather new.