By Tsuey Cham
A few weeks ago we took a look at coal seam gas (CSG) and the hydraulic fracturing (‘fraccing’) process used in its extraction. You may have also heard of shale gas, another type of natural gas found deep underground.
So what exactly makes them different?
In terms of their gas content they’re really quite similar, with both made up predominantly of methane – the type of gas used in homes for cooking and heating.
However, when it comes to extraction and production CSG and shale gas can be quite different. For example, CSG can be found up to about 1000 meters underground, whereas shale gas is found much deeper, usually 1500 to 4000 meters below the surface.
In Australia, hydraulic fracturing – a technique that increases the rate of gas flow for extraction – is used in CSG production 20-40% of the time, whereas in shale gas production it’s used every time.
Another interesting difference is that the process used to extract CSG produces more water than it uses – so there are large quantities of water produced as a by-product. Conversely, for shale gas, the extraction process uses more water than it produces.
Watch our latest short animation to find out more about shale gas, how it’s extracted and some of the potential environmental challenges involved in its production:
If you missed the animation on CSG extraction, watch it here.
Australia’s Biodiversity series – Part 12: Conclusions
When talking about the fate of biodiversity it’s easy to get bogged down in doom and gloom—we know that it’s in decline, that human populations and demand for resources continue to grow, and therefore the pressure we’re putting on other species is increasing, and that big gaps remain in our understanding of the biodiversity that’s out there.
But there are solutions. Since the concept of biodiversity first emerged in the 1980s, the science dedicated to understanding our natural systems has come a long way. With the emergence of new technologies it has become possible to find out far more about the species we share the planet with, and we can do it with far more efficiency.
It’s these big challenges and scientific solutions that we focused on in our book, Biodiversity: Science and Solutions for Australia. In the twelfth and final video in our Australia’s Biodiversity series, the book’s editors, Dr Steve Morton, Dr Mark Lonsdale and Dr Andy Sheppard, engage in a panel discussion about the future of biodiversity science in Australia:
You might like to read the concluding chapter of CSIRO’s Biodiversity Book to find out more about the scientific solutions that could help us address the big threats to Australia’s biodiversity.
And if you’ve been inspired to get more involved in the management of our biodiversity, there’s a lot you can do—even from your computer. Visit the Atlas of Living Australia to find out about volunteer opportunities.
You can find all the videos from our biodiversity series on our YouTube channel.
Australia’s Biodiversity series – Part 11: Mining
Many people worry about the environmental impacts of mining, but as a society we have a growing demand for its products. Most Australian’s consider it worthwhile and a valuable industry for the nation’s prosperity, as our recent national survey indicates.
The direct impacts of mining on biodiversity are relatively limited compared with other major land uses—less than 1% of the Australian land area is used for mining, while 62% is used for agriculture for example.
The greatest threats to biodiversity from mining come from the cumulative impacts of the infrastructure required for mining operations—roads, ports, pipelines, shipping etc. Science can help to assess any potential implications for biodiversity from mining development so that impacts can be better managed and rehabilitation and offsetting efforts can be more effective.
In the eleventh video of our Australia’s Biodiversity series, Dr Alan Andersen talks about the main impacts of mining on biodiversity and how these can be appropriately managed through processes like strategic regional assessments, use of bioindicators in rehabilitation, and biodiversity offsets:
To find out more about mining and biodiversity in Australia, you might like to read the corresponding chapter of CSIRO’s Biodiversity Book.
Last week’s video looked at the biodiversity in our inland water systems and how our approach to water management impacts ecosystem health. You can review it and the other videos in the series on our YouTube channel.
Australia’s Biodiversity series – Part 10: Inland waters
Even though it is one of the world’s most arid continents, Australia’s inland waters support a rich diversity of life.
Rivers, streams, wetlands, floodplains, lakes, underground aquifers—we’ve got them all and they all support native species.
Biodiversity is enhanced by the wide variation in rainfall across the continent and the change in climate from the tropical north to the temperate southern regions. Life in Australia’s inland water ecosystems has had to adapt to the ‘boom and bust’ that comes from periods of both extreme dry and extreme wet.
Human development has had a dramatic impact on these ecosystems, particularly in the Murray Darling Basin and other areas in the southeast, as we use water for our cities and towns and for irrigated agriculture. These water uses are obviously of great benefit to the Australian population but the use of the water and the infrastructure associated with it can disrupt the natural flows of water and nutrients through inland water ecosystems, which native plants and animals depend on.
In the tenth video of our Australia’s Biodiversity series, Dr Carmel Pollino talks about Australia’s unique inland water ecosystems and how water can best be managed for the benefit of biodiversity and our communities:
To find out more about the biodiversity in our inland water ecosystems, you might like to read the corresponding chapter of CSIRO’s Biodiversity Book.
Australia’s Biodiversity series – Part 9: Seas and coasts
Life originated in the oceans 3–5 billion years ago and even today 20 of the 33 animal phyla (the highest groupings within the animal kingdom) remain confined to the sea. That means that most life under the sea is like nothing we find on land.
Worldwide there are big gaps in our understanding of the oceans and the life within them. Our exploration of Australia’s marine biodiversity has been limited mostly to the margins of the continent, on the continental shelf and the upper continental slope. Even near the continent, some 50–70% of the species we’ve found in recent surveys have never before been seen by scientists.
New technology and equipment, like autonomous robotic vehicles and electronic tagging, as well as our brand new marine research vessel, RV Investigator, is allowing us to explore in ways we’ve never explored before and so we can begin to address those knowledge gaps.
In the ninth video of our Australia’s Biodiversity series, Dr Alan Butler and Dr Nic Bax talk about the unique habitats of the sea, the challenges it poses to exploration, and new tools and technologies helping us discover and manage the biodiversity it holds:
To find out more about discovering biodiversity in the ocean, you might like to read the corresponding chapter of CSIRO’s Biodiversity Book.
Australia’s Biodiversity series – Part 8: Cities and towns
Cities are one of the great inventions of civilisation. They are centres of knowledge, invention and cultural change. But how good are they at supporting the local plants and animals?
Cities tend to have been built in areas of high biodiversity, with rich soil and permanent water supplies, and so there may be more species living in and around your city or town than you think. Simply punching your postcode into the Atlas of Living Australia will give you a list of everything that’s been recorded there.
Of course, the fact that there’s now a city on that land will have impacted species’ ability to persist there. The way we design and lay our cities out has an influence on how extensive that impact is, and will continue to be important as cities and populations grow.
Cities occupy just 2% of Earth’s surface but account for 75% of the resources consumed by humans. That sort of resource use represents one of the biggest challenges to the world’s biodiversity. But being centres of cultural change, cities also present many opportunities to engage people in supporting biodiversity conservation efforts.
In the eighth video of our Australia’s Biodiversity series, Dr Mark Lonsdale talks about the relationship between cities and biodiversity and some of the big ways cities can play a role in supporting our biodiversity in coming decades:
To find out more about the relationship between our cities and towns and biodiversity, you might like to read the corresponding chapter of CSIRO’s Biodiversity Book.
Australia’s Biodiversity series – Part 7: Farming, pastoralism and forestry
Australian agriculture provides food and fibre for millions of people in Australia and around the world, but it can come at a cost to our environment and biodiversity.
There is a range of intensities of primary production in Australia today. Hunting and gathering and use of fire to manipulate the abundance of native species is at the lowest end of the spectrum, then livestock grazing of native pastures, right through to complete replacement of native species for intensive cropping and forestry plantation (the latter requiring inputs in the way of fertilisers, machinery, chemicals etc.). The more intensive the production method, the more food and fibre can be produced per unit area, but with greater impact on biodiversity. Less intensive production methods provide opportunities for native species to coexist with production.
Better management of our agricultural landscapes can enhance biodiversity, and in turn, enhanced biodiversity can benefit agriculture through services like pollination and recycling nutrients in soils.
In the seventh video of our Australia’s Biodiversity series, Dr Sue McIntyre talks about the different intensities of agriculture in operation across Australia and what research is telling us about better managing practices to continue supporting biodiversity in those landscapes:
To find out more about managing agricultural landscapes for biodiversity, you might like to read the corresponding chapter of CSIRO’s Biodiversity Book.