Trees cause more pollution than automobiles do.
The Great Smoky Mountains in the Appalachians are so called because of the VOCs released by trees in the area, causing a persistent orange smog. To put it into perspective, though, trees also absorb carbon dioxide and give out oxygen, so overall they do more good than harm. The same is probably not true of automobiles or emulsion paint. So if it's possible to make paint without the VOCs it sounds like a good thing to me.
I was surprised to find eco paints in a big DIY chain like Homebase. I thought I'd have to order them off the internet, or maybe drive miles to some small retailer off the beaten track. Next time Stephanie talks me into redecorating a room, we'll head to Homebase and look at the earthBorn paints. I still want to do more research about eco paints and VOCs, but this is a start.