I offset the carbon emissions through Terrapass (http://www.terrapass.com/). It's not perfect, I know, but I can't afford a Tesla at the moment without liquidating my TSLA stock.
Since when are services built on sound science "indulgence-style"? It wasn't like I drove to Florida on a vacation; I was taking care of a family member. I'm not supposed to go because I'm releasing ~2 tons of carbon? Bah.
There's nothing wrong with driving far distances, it's just that money negating pollution is silly to me, as incongruent as a tithe forgiving sins. You can't just wring automobile emissions out of the sky, and a donation doesn't change the fact that the extra car on the road causes other cars to slow, producing more emissions, increasing demand for road infrastructure and such.
[EDIT] I used this website to calculate http://calculator.carbonfootprint.com/calculator.aspx?tab=4