[For a few moments, he stares at her as if she's grown a second head, because all of those things are perfectly normal where he comes from, and wouldn't need any explaining at all.

But apparently this girl is just uneducated or something.]

Trolls and Giants are not just fairy tales, thanks. I've fought them before. I even killed a Giant! With explosives! I don't know what the Amazon or the Congo are, but if they're forests they probably have the Rash in them.

[A little noise of frustration.]

The Rash is this disease, it infects people and turns them into monsters. Animals too. The only way to really get rid of it is to burn the forest down and make sure the infected animals and people and stuff are all dead so they can't spread more Rash. Then the trees grow back after, or you can build farms there for food and stuff.