A DC Taxi Day (though not an Envirotaxi) by Wayan

Apparently, getting a cab in DC is as easy as Twittering to @taxinow (aka EnviroRide.net taxis) your start and finish destinations, and they’ll route you a cab. For those of us who absolutely hate using the phone to talk to cab companies, this seems like a really straightforward way to get from point A to point B without having to call ahead.

Sure you might want to give it a little bit of time to get there, but this sounds vastly preferable to calling the call center, to me.