Sabbatical

I’m off into the field again for a week. Since the geoblogging around here has been fairly light of late, you might not even miss me. Hopefully, a bit of fieldwork is just what I need to get me out of the slight creative hole that I’ve found myself in of late.
Also, since I’m going to be in the same area, I’m hopefully going to get a look at this outcrop again.

Categories: bloggery

A planet is for life, not just for Earth Day

Note added in proof: I see that Andrew has written eloquently on a similar theme, and is also hosting the latest Accretionary Wedge, which collects other geoblogospheric thoughts on Earth Day.
So, today is Earth Day. Whilst I’m never going to be completely opposed to attempts to get people to think more about their impact on our planet, and how we might do something to minimise it, it seems to me that focussing on today as a singular event is missing the point. If it’s to mean anything, this shouldn’t be the one day in the year when people “do something” for the environment; it should be the day when everyone reaffirms their commitment to do something every other day of the year, too.
As I commmented once on ye olde blog (you’ll need to head to the bottom), one of the problems with modern society is that the more environmentally sound choice is almost never the easiest, or the cheapest, or the most convenient, and hence our good intentions run into the plain fact that no-one can be bothered all of the time. I know that I don’t always switch off lights when I leave a room, or make sure I’m not overfilling a kettle, and I can hardly claim that I don’t know better. Sometimes, I’ll even feel a small pang of guilt when I realise that I’m taking the path more damaging, but this isn’t always enough to stay my hand. The problem is so vast, and in many ways so distantly related to our day-to-day life, that its hard to face environmental issues with any sense of personal urgency.
It’s certainly true that our individual impact on pollution or greenhouse gas emissions is very small on its own. But the fact that we do face serious environmental problems attests to the fact that when you multiply an action by five or six billion people, it can have a substantial effect on the world around us. But again, that’s a fairly abstract call to arms. It seems that we’re missing is a sense of connection with the planet, to make it’s welfare matter a bit more to us personally. And, I realise, I have felt such a connection many times before:

  • I hike up to the top of a ridge in the fading light of an overcast summer day. As I reach the brow, I’m treated to an awesome panorama – soaring mountains behind, wide valley in front, glacier in the middle.

    Parkerpan.jpg

    Although this is a popular viewpoint, at this time of day I’m the only one there. I sit down and for a good 30 minutes do nothing but drink in the spectacle and the silence.


  • A shadow suddenly falls on the path in front of me. I look up, and see a golden eagle gliding serenely past not ten feet above my head – I can make out individual feathers on its underside. It eyes me coldly, and having decided that I don’t look particularly edible, soars away on a thermal.

  • As I make my way across the hills towards a new outcrop, the wind is so strong that some gusts almost send me flying. Every step forward is a struggle. Sheets of water lifted up from some nearby lakes are periodically dumped on top of me. I feel so alive, I’m almost manic. It’s glorious.

These are just a few of a store of precious memories which I have called upon many times to calm me when I’m stressed or flustered, to lift me when I’m feeling depressed, or simply to remind me why I love my job when I find myself uninspired. But maybe I should give them a bit of unselfish work to do as well. In a certain sense, these experiences are gifts to me from the Earth, and they have enriched, and continue to enrich, my life in countless ways. Next time I’m tempted to drive rather than walk to the end of the street, or get the elevator rather than take the stairs, or forgo the trip to the bottle bank, I should remember what the Earth has given me, and let my gratitude inspire me to give something back. Perhaps you have some recollections which will help you do the same.

Categories: environment, ranting

Rock Gallery

You may or may not have noticed a new addition to the row of tabs just beneath my banner. The ‘Rock Gallery’ is a new way I’m trying out of showing what’s in the archives, taking advantage of the fact that I quite often illustrate my posts with pretty pictures or diagrams. I’m gradually producing thumbnails of the prettiest, and clicking on them will link back to the post in which they originally appear. It’s a bit of an experiment, so let me know what you think.

Categories: bloggery

How big was that asteroid? The latest geochemist/geophysicist smackdown

ResearchBlogging.orgGeophysicists estimate the size of asteroids associated with past impact events, such as the one associated with the Cretaceous-Tertiary extinction, by comparing the craters they form to the results of impact models. Geochemists estimate the size of these objects by measuring the amounts of exotic elements such as iridium that have been brought down to Earth with them. Because geophysicists and geochemists also love to disagree with each other (just ask them about mantle convection), it’s no surprise that these different methods disagree. In fact, as Francois Paquay of the University of Hawaii and his colleagues report in their recent Science paper, in the cases of the KT impact and one of several impacts in the late Eocene, they disagree by a factor of three or more. Who’s right?

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Categories: geochemistry, geohazards, geology, planets

Distressingly normal corals infest nuclear test crater

bikinicorals.jpg

Corals are always quite photogenic, but pretty as these examples are, what’s most fascinating is where these things are growing: in one of the craters left by the US nuclear testing on Bikini Atoll in the 1940s and 1950s.

Castle_bravo_crater.jpg

Castle Bravo Crater was excavated by a 15 megatonne nuclear bomb in 1954, and it was recently visited by a team of divers from the Australian Research Council Centre of Excellence for Coral Reef Studies as part of a study of how the atoll is recovering from the effects this and the other Bikini nuclear tests. From the Centre’s press release:

After diving into the crater, Zoe Richards of the ARC Centre of Excellence for Coral Reef Studies and James Cook University says, “I didn’t know what to expect – some kind of moonscape perhaps. But it was incredible, huge matrices of branching Porites coral (up to 8 meters high) had established, creating thriving coral reef habitat. Throughout other parts of the lagoon it was awesome to see coral cover as high as 80 per cent and large tree-like branching coral formations with trunks 30cm thick. It was fascinating – I’ve never seen corals growing like trees outside of the Marshall Islands.

“The healthy condition of the coral at Bikini atoll today is proof of their resilience and ability to bounce back from massive disturbances, that is, if the reef is left undisturbed and there are healthy nearby reefs to source the recovery.”

However the research has also revealed a disturbingly high level of loss of coral species from the atoll. Compared with a famous study made before the atomic tests were carried out, the team established that 42 species were missing compared to the early 1950s. At least 28 of these species losses appear to be genuine local extinctions probably due to the 23 bombs that were exploded there from 1946-58, or the resulting radioactivity, increased nutrient levels and smothering from fine sediments.

“The missing corals are fragile lagoonal specialists – slender branching or leafy forms that you only find in the sheltered waters of a lagoon,” Zoe explains. While corals in general have shown resilience, Zoe adds that the coral biodiversity at Bikini Atoll has proven only partially resilient to the disturbances that have occurred there.

We all know that what should have happened is that the diving team vanished without a trace, leaving behind only grainy footage of an attack by mutated giant cnidarians, but I suppose that this is the next best thing. More pictures can be found here.

Categories: environment