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I tell myself the scientists know what they're talking about, and I'm keen to do my bit to prevent catastrophe, but at the same time I want to continue the same comfortable lifestyle I'm used to.
I know flying is highly polluting, but it doesn't stop me jumping on planes. I find a dozen ways of justifying it, from the futility of personal boycotts to the much worse pollution of deforestation or farting cows.
Do I leave my equally toxic car to rust away in the garage? Of course not. I can't possibly rely on the vagaries of public transport to get me where I need to go. And I've frozen to death at bus stops once too often.
Much as I agree with slashing energy use, I'm not quite prepared to shiver through the winter or dump all my household appliances to stop the odd Arctic glacier melting.
I suppose deep down my problem is this - if the environmental crisis is so colossal and so desperate, then it can only be averted by lifestyle changes on a scale far exceeding the petty tweaks and gestures of well-meaning individuals.
However much I'm told that every little bit helps, we all have to pull together, it's a joint effort blah blah, I can't help feeling that everything I'm doing is a mere drop in the ocean that counts for little.
At the end of the day, a threat this big has to be confronted by national governments. Relying on individual goodwill is a bit like rearranging the deckchairs as the Titanic heads for the iceberg. Or fighting Hitler with Dad's Army. There's just too much at stake.