A science presenter, writer, speaker & former TV host; author of The Skeptic's Handbook (over 200,000 copies distributed & available in 15 languages).


The Skeptics Handbook

Think it has been debunked? See here.

The Skeptics Handbook II

Climate Money Paper




The nerds have the numbers on precious metals investments on the ASX



The chemistry of ocean pH and “acidification”

The ocean acidification threat is a big can of worms. I asked Professor Brice Bosnich to help create a quick reference page on the chemistry and was pleased he could find the time to help. Here’s everything you wanted to know about the basics…

He explains what pH means, and points out that:

Ocean pH varies by 0.3 naturally. Claims of acidification since 1750 are based on dubious models and few observations.

There are reasons to assume that marine life will not be overly affected by an increase in ocean acidity due to atmospheric carbon dioxide:

Ocean life evolved and survived far higher levels of CO2 for millions of years in the past. Marine organisms actively create carbonate shells (using energy) which means crustacea, corals and molluscs aren’t automatically prey to pH changes in the same way that say a limestone rock would be. The world’s oceans may have warmed a mere 0.17C since 1955, hardly a significant threat to marine life.

We also find out that acidic water is added to the ocean from rainfall and floods (and he explains why raindrops will always be acidic).

There are more pressing threats. — Jo


Guest Post by Professor [...]

Glikson: descends to pseudo-psychology and projection?

Dr Andrew Glikson

Remember the Great Debate between myself and Dr Andrew Glikson?  He’s back – in Climate change denial: The misrepresentation of climate science he calls names, resorts to inventing a mental illness, creates strawmen whom he beats down mercilessly, all the while misrepresenting thousands of scientists who disagree with him, and making statements that can be proven false with a few seconds of Googling.

12.30 pm 14 December 2010. Hedley Bull Lecture Theatre 1 Australian National University

We are most fortunate that Brice Bosnich managed to pop in and report on what Glikson had to say (below). I wish I could have been there to hear Brice ask those questions….

Glikson knows the main Skeptic arguments, so why did he ignore them?

In the Great Debate of May 2010, Andrew Glikson and I exchanged replies in a five part series that took six weeks and amounted to over 17,000 words, 26 graphs, and dozens of references. It’s the only long serious climate debate in writing that I’m aware of. He was unable to provide convincing empirical evidence to back up his claims of impending catastrophe. He asked if he could respond [...]