There were a couple of small Australian solar power projects that I left out of my look at solar thermal power a little while ago, as I thought they were worthy of separate consideration.

I talked about one of these - Wizard Power's technique for storing energy using ammonia - last week. The other project is by a company called Acquasol which is building a plant to desalinate water using solar thermal energy at Point Paterson, near Port Augusta in South Australia.

Like Wizard Power and Lloyd Energy's graphite based energy storage technique, Acquasol received an initial round of funding from the (now defunct) Australian Greenhouse Office's Advanced Energy Storage Technology program.

In this post I'll look at the Acquasol project and then more generally at water scarcity worldwide and some of the approaches being taken to tackle it.

As I mentioned in my last post, this is the time for Seasonal travel, and so, for the first time it finds us, transiently, in Western Massachusetts. Picking up the local paper The Sunday Republican I discovered tht they are in the midst of a series on Energy in the 21st Century. The series began with an article on solar power , which was followed by one on nuclear power and then by one on the use of coal. The latest, which first caught my attention, is on power from water. There will be two more in the series, one next week on biofuels, and then one the following week on wind.

This is a guest post by WisdomfromPakistan. Wisdom is a computer engineer living and working in Karachi, a cultured city of some 20 million people. He has been conducting his own research into human nutritional requirements and the Earth's carrying capacity which he now wants to share with The Oil Drum readership.

As peak oil approaches, shortly followed by peak gas and eventually peak energy, we have to retreat to agriculture as the prime energy producer in society. Post-peak agriculture will be radically different to modern agriculture. Today’s agriculture is more an energy consumer than an energy producer. In developed countries it takes ten calories worth of energy from fossil fuels put into a farm in the form of fertilizers, pesticides and transportation fuel, to get one calorie back in the form of food (see also here and here).

Happy children fetching water

In Alberta, the debate of the the tar sands royalty review is heating up. Major companies are threatening to pull investments in the province, while other point out that a peaking world offers them few other options. The environmental effects of large-scale bitumen mining, which are not considered often enough, are discussed in detail in journalist Willam Marsden's new book.

On the other side of the country, LNG shipments seem set to ignite a political row over safety in narrow shipping lanes. Nuclear appears to be approaching a revival, although cost is an issue. The effects of climate change are making themselves felt across the globe, notably in the Australia and in the Arctic, where Inuit climate change campaigner Sheila Watt-Cloutier could be about to share the Nobel Peace Prize with Al Gore. (More under the fold!)