The scariest things about climate change are what we don't know

Some argue that, when it comes to climate change, we should play down our uncertainties -- because climate-change deniers will just seize on those unknowns as an excuse for inaction.

Clinging to survival

But in a brief, highly topical essay just published today, TESS director Bill Laurance argues that scientists have to be entirely frank about uncertainty -- and that many of the scariest things about climate change are in fact the things we don't know.

Read the essay here. 

In just three minutes you can get a sense of what we we know, what we don't know -- and what we don't know we don't know about climate change.