Volvo delivers 50,000th VEST-equipped truck

I do like the new Volvo trucks we have. I'm less enthusiastic about the cost of DEF (diesel exhaust fluid) that we seem to have to put in them to make them run "green." Does anyone else find it ironic that we're saving the environment by using a truck which reduces emission by using DEF, but the containers themselves become waste (we're still not even completely sure if they're safe to put with regular recycling.)