It's pretty Spartan, all things considered, and it's about as much fun to drive as a hobby horse, but Toyota's 2017 Prius C hybrid hatchback is still a decent little car that does a lot with a little. And, at a starting list price of $21,975, it doesn't cost a huge amount of cash to save the Earth.
On the other hand, you could buy a gas-fueled 106 hp Yaris SE five door hatch with an automatic transmission for about $19,510, sans taxes, fees and other kilos of flesh. The Yaris probably won't get the excellent 4.5 litres per 100 km that I achieved in the Prius C (despite my lead foot), but Toyota claims 7.9/6.8 (City/Hwy) for the Yaris, which is still darn good. And the Yaris is a heckuva lot more fun to drive, if only because it doesn't come with a whiny continuously variable transmission.
Sure, you'll be poking the Al Gores, David Suzukis and "Science Guys" of the world in the eye, but how is that a bad thing?