Amongst developed countries, we’re nothing special, ranking 51st. This is from the Yale Environmental Performance Index. Though plenty of caveats need to be kept in mind, and the report itself is full of the implicit assumption that everything is always and everywhere better when it’s quantitatively measured (something that isn’t true), it seems to be about as thorough as these things can reasonably be.
Here’s their map of the world. If you’re keen on the environment head to Scandinavia (with France being an honorary Scandinavian for these purposes) and better still North West Scandinavia (Iceland), which also seems to be making a better fist of recovering from it’s GFC meltdown than other countries (hint: if things get too bad, default). Antarctica and Greenland are also in pretty good shape, though I hear they can get quite cold.