I don't want to sandbag something that could help. but I'm not sure I get the point. Ok i do now.
You feel guilty for your excessive carbon output. So you buy credits. Those credits then are used to pay for research/businesses/things that reduce or sequester carbon emissions. Doesn't this seem like a cop-out? I realize that expecting the average person to change their lifestyle, even the slightest bit, is a stretch, since after all we can't even seem to stop eating like shit, which directly and immediately affects us. Carbon is a longer term problem, which might not even affect some people because they will die before then. Of course something is better than nothing, usually, but i wonder if its just distracting away from the real problems and solutions?
In the end though, it is a good thing. Although I do still feel there is a danger though that this method of "buying your way out of jail" can breed a lackadaisical way of thinking. "Oh i did bad, i'd better pay some money." It's kind of like when people eat badly, they work out more trying to undo the damage, mostly out of guilt. Guilt can be good I suppose in getting what you want. But, in the same vein it is true, that the lemmings need a leader, and offsets can be that leader that will hopefully steer them away from the cliff.
update: Coincidentally someone far more knowledgeable in the "Green" ways of thinking at
Treehugger chimed in on the same exact subject about 2 hours after me. much more eloquent than I. Good read, and good points. I agree!