The present fossil fuel economy is unsustainable because of pollution. Don't swallow the oil companies talk of the scarcity of oil saving us because oil is NOT scarce (take a Geologist's word for it, we Geologists find the oil), they have been pedalling this false idea for their own purposes since 1910 at least. The apparent shortage of our reserves is due to only economically viable reserves being counted, these are reserves that can be profitably removed at present oil prices and with present technology (if oil is short prices will increase which they aren't and new technology will be developed). As well as these reserves there are resources which are known or believed to exist but not PRECISELY delineated which are about 10 times the size of the known reserves, in addition much more Natural Gas than all this is available, Oil Shale is more massive than this and will be economic as prices rise and Coal of which we have at least 300 years supply is available. So the fact remains that we must improve renewable energy sources till we all rely on renewables.
Some of the energy sources which we Aussie lunatics waste are:
The few renewable energy installations here which Australian governments haven't managed to stop being built have done extremely well (the liberal party is slightly worse than the labor party in this respect when they manage to lie their way to power, another reason they are often called the fascist party).
Wind Energy - 
(shown is the windturbine at breamlea in Victoria which we should have more of)
The Southern coastline and the island state of Tasmania are in the roaring forties where strong winds circle the earth so great candidates for wind generation can be found here
Solar Energy - 
(we should have installations as above instead we have some small private PV arrays)
There is a lot of land where there are very few clouds to shade solar collectors (but in most of Australia there is no water available for use if water is needed), one solar application which we do use is domestic solar thermal (mainly domestic water heating), but Australia wastes it's plentiful solar energy resources
Tidal Energy - The NorthWest coast has tides over 10 meters in height (but the many cyclones there could destroy installations, and there are very few customers for the energy unless you could develop a way to transmit it to Indonesia approximately 500km away where the Indonesian government is always saying their people desperately need power and threatening to build nuclear reactors on geological faultlines where there are a lot of earthquakes)
Wave Energy - Australia doesn't use wave energy at all even though our extensive Southern coast borders a very rough sea that extends all the way to Antarctica (thousands of kilometers away), our Western coast borders the Indian Ocean with it's thousands of kilometers of water with many cyclones and other storms, and half of our Eastern coast which borders the Pacific Ocean
Hydroelectricity - Australia is not mountainous so hydro resources are limited and not utilized to any great extent except in the island state of Tasmania where all the grid electricity is generated from hydro, unfortunately this has led to drowning of some of the countries most beautiful landscape and to some great environmental disputes
Biomass - Australia being a major foodgrowing country (though we have difficulties such as very low rainfall and low-nutrient soils) and so should be well placed to but does not use this energy source mainly out of apathy
Geothermal - There are basically two methods of tapping Geothermal Energy a)Natural Hot groundwater
and, b)Hot Dry rocks:See below (more technological information is available at Geothermal
NOTE : Only 6% of Australia's official energy (Official statistics ignore the Sun's role in heating and lighting) comes from renewable sources compared with a worldwide average of 12% (this is probably due to us not using fuelwood for heating to an apreciable extent, we send our trees to Japan for chopsticks or building frames, and as woodchips for packaging or papermaking feedstock), and the Federal Government (especially little Johnnie Howard, the PM) have decided this must not increase and so have cut 80%-90% from the budgets of all energy efficiency programs in Australia and have used a study paid for by the Coal Industry to argue we cannot afford to cut greenhouse emissions (we all know jobs and other income would be increased if we cut greenhouse emissions).
Alternative Technology Association
Australia's best alternative energy association
The Centre for Alternative Technology Home Page
experimentation centre in Wales
Energy Efficiency and Renewable Energy Network
Solstice: Sustainable Energy and Development Online
Battery maker and Supplier, sounds interesting.
One of the best ways for us to reduce our greenhouse emissions and to further improve our quality of life (which non-Australians who visit seem to think is very good) is to extend our public transport networks. Most transport within Australia is private (this is mainly due to the enormous distances which must be travelled in the countryside) and it is about time the politicians realise extending public and helping eco-friendly private transport would be a vote-winner (and so keep them in their cushy jobs), not only winning the votes of us greenies but also the people whose lives could be improved (mainly urbanites but also people outside the capital cities). Seen below is some of the eco-friendly private transport being developed by Greenspeed
Victoria's public transport Home Page
rides around victoria
A very large depository concerning victoria's public transport including a large historic photogallery.
Bicycle Federation of Australia
Greenpeace International Home Page
Alternative Technology Association
Alternative everything (especially energy projects)
The Australian Greens - Victoria
The Australian Greens believe they are the oldest Greens party in the world (est. 1972)
Australian Conservation Foundation
An Australian environment group formed in Tasmania (an australian state) after losing and winning some of the world's largest environmental battles.
LandcareWeb - Landcare Home Page
Very good Australian organisation repairing damage done to the Australian environment
Bicycle Federation of Australia
Includes rides in Victoria
Australian Nature Conservation Agency
Beware of government propaganda!
Australian Environment On-Line
Beware of more government propaganda!
Home Power Magazine, the hands-on journal of home-made power
Betterworld zine
I take NO responsibility for anything that may happen if you use the services provided by the below groups, I am only saying these services exist NOT promoting them
GreenspeedGreat Aussie recumbent bicycles.
Sustainable Technologies Australia
Rainbow Power Company Introduction Page
Battery maker and supplier, sounds interesting.
A good independent power supply seller and energy use adviser in the US, definitely worth a look.
The IEA CADDET Renewable Energy Home Page
GreenMoney Guide to the World Wide Web
Permaculture International Homepage
I take NO responsibility for anything that may happen if you use the services provided by the below groups, I am only saying these services exist NOT promoting them
Australia's largest Ethical Investment Manager