Too many geologists appear to have lost faith in geological processes. Instead they call upon 'satan ex machina', as explored entertainingly in the movie The Fifth Element. The dinosaurs were not hit on the head by an asteroid (or even two). If someone as much as sneezes these so-called geologists invoke a killer asteroid. Have more faith in your training! Geology happens because of geological processes. Volcanic eruptions, lava flows, plate tectonics and salt domes are examples of what is perfectly good enough to explain much of what happens here on Earth - after all, look at Venus. The latest examples of asteroid-mania is the claim by UK geologists who, feeling left out of the limelight, are insisting that fomer salt dome structures in the North Sea are the UK's own meteor impact craters. What is wrong with these people? I am starting to wonder if they have been 'got at' by Creationists.
In contrast, methane hydrates represent a real tipping point ready to topple. Global warming threatens to release these extensive greenhouse deposits, as happened at the end of the Permian, roasting the Earth for hundreds of thousands of years. This is a bona fide, if catastrophic, geological process that has rapid and far-reaching consequences. (I consider this issue in greater detail in my website: Green.)
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