To make good decisions (about tree risk) means that we have to have confidence in what we do know and what we don't know.  This double-header about confidence is a great listen from the BBC World Service.

It's probably not much of surprise to find out there's very little overlap between confidence and competence; how good people think they are, and how good they really are.

Confidence: Why it misleads us

But confidence can also be a force for good.  Here's how.

Confidence: How it can help us