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Ward off Climate Change

About the author

Gary Warden was raised in the Perth Hills. After graduating from the University of Western Australia with a degree in Geology, Gary joined BHP Billiton where he spent 18 years working in a variety of roles in a number of locations around the world. Prior to leaving BHP Billiton in December 2006, Gary was Global Manager for the company's US$1Billion business improvement program.

While he was originally sceptical about the claims relating to climate change, he became convinced of the urgency of the issue in early 2006. He left BHP Billiton primarily to spend more time with his young family, but also to dedicate himself to creating a more sustainable life for himself and his family and to support others in making that change.

In September 2007 he was trained by Al Gore and has delivered the "Inconvenient Truth" lectures to thousands of west australians since then. In November 2007 Gary ran for the senate in the Federal Election representing the Climate Change Coalition.

In addition to his climate change lectures, he has facilitated Living Smart workshops across Perth. Between 2008 and 2009 he was on the Executive Committee of the Conservation Council of Western Australia including one year as Vice President.

Gary co-founded and is Executive Director of the very exciting Days of Change program, one of the largest sustainability programs in Australia and is now General Manager WA for Eco-Kinetics, one of the largest Solar PV companies in Australia and subsidiary of ASX-listed CBD Energy.

Diesel is not better than Petrol

by Gary 4/8/2008 10:06:00 PM

For some time I have been telling people that diesel cars produce less Greenhouse Gas emissions than their petrol equivalents.

I was staggered to find (by accident) recently that this is simply not the case.

I was looking at the various factors used by the on-line emissions calculator at and found that a diesel vehicle emitted more greenhouse gases than a petrol vehicle of the same type and size. When I quizzed Carbon Neutral about this they confirmed this and stated that their factors come from the Australian Greenhouse Office's Forms and Factors Workbook.

Interestingly, LPG is significantly better than petrol.

So, don't run out to replace your petrol car with a diesel car if you are doing this thinking that you are going to reduce your emissions. You won't. They will actually go up slightly. This is because diesel has a higher emissons factor than petrol (CO2 emissions per litre of diesel consumed), which more than offsets the benefits of better fuel economy of diesel. It gets worse because it is thought that particulate emissions from diesel vehicle might exacerbate global warming. See article.

I'm devastated as I deliberately bought a diesel utility thinking that I would be minimising my impacts on the environment. The good news is that our decision to buy a Prius has been vindicated. It is still the greenest family car on the market. See Green Vehicle Guide.

If you are struggling to sleep at night, or are questioning the AGO numbers, then you can check out their Forms and Factors workbook here

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Climate Change | Reduce Your Emissions

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10/31/2008 8:15:54 PM


Diesel may produce more emissions than petrol when you run a car. But..... what produces more emissions, making Diesel or making Petrol? So many emissions are produced making petrol compared to diesel. Therefore, Diesel may be worst coming out of a car but to produce petrol will cause a lot more emissions/pollutants!

Brad au