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East Asia
South Korea & China - Images and Movie
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- Written by: Richard_McKie
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- Category: East Asia
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I'm a bit daunted writing about Berlin.
Somehow I'm happy to put down a couple of paragraphs about many other cities and towns I've visited but there are some that seem too complicated for a quick 'off the cuff' summary. Sydney of course, my present home town, and past home towns like New York and London. I know just too much about them for a glib first impression.
Although I've never lived there I've visited Berlin on several occasions for periods of up to a couple of weeks. I also have family there and have been introduced to their circle of friends.
So I decided that I can't really sum Berlin up, any more that I can sum up London or New York, so instead I should pick some aspects of uniqueness to highlight.
As anyone who has followed my website knows, I'm not a fan of using 'Green Hydrogen' (created by the electrolysis of water - using electricity) to generate electricity.
I've nothing against hydrogen. It's the most abundant element in the universe. And I'm very fond of water (hydrogen oxide or more pedantically: dihydrogen monoxide). It's just that there is seldom a sensible justification for wasting most of one's electrical energy by converting it to hydrogen and then back to electricity again.
I've made the argument against the electrolysis (green) route several times since launching this website fifteen years ago; largely to deaf ears.
The exception made in the main article (linked below) is where a generator has a periodic large unusable surpluses in an environment unsuitable for batteries. In the past various solutions have been attempted like heat storage in molten salt. But where there is a plentiful fresh water supply, producing hydrogen for later electricity generation is another option. Also see: How does electricity work? - Approaches to Electricity Storage
Two of these conditions apply in South Australia that frequently has excess electricity (see the proportion of non-hydro renewables chart below). The State Government, with unspecified encouragement from the Prime Minister and the Commonwealth, has offered A$593m to a private consortium to build a 200MW, 100t hydrogen storage at Whyalla. Yet, the State already has some very large batteries, with which this facility is unlikely to be able to compete commercially. Time will tell.
Carbon Sequestration Source: Wikimedia Commons
At the present state of technological development in NSW we have few (perhaps no) alternatives to burning coal. But there is a fundamental issue with the proposed underground sequestration of carbon dioxide (CO2) as a means of reducing the impact of coal burning on the atmosphere. This is the same issue that plagues the whole current energy debate. It is the issue of scale.
Disposal of liquid CO2: underground; below the seabed; in depleted oil or gas reservoirs; or in deep saline aquifers is technically possible and is already practiced in some oil fields to improve oil extraction. But the scale required for meaningful sequestration of coal sourced carbon dioxide is an enormous engineering and environmental challenge of quite a different magnitude.
It is one thing to land a man on the Moon; it is another to relocate the Great Pyramid (of Cheops) there.
