Severity of the Current Drought (Australia)

Over at Jennifer Marohasy's blog, a frequent commentor, "Luke", has an interesting guest post. Jennifer is one of those self proclaimed "climate agnostics" who nevertheless posts on how Al Gore is all wrong, polar bears are going to be fine, there's no consensus, warming stopped in 1998, the temperature rise is UHI effect etc, etc. A recent spate of posts about the drought in Australia have been