Nothing to swap. I've never not considered the planet when it comes to washing.

PLanet Ark powder is actually a bumsteer. Most liquids, like Amolin Sensitive, are actually better for the environment because they have lower sodium levels.

Check out Lanfax Laboratories for the lowdown.

And soap nuts are awesome. I chuck a bit of lavender oil water in with the rinse cycle because I love a nice smell. I use Earth Choice liquid or a woolwash on the really hardcore dirty stuff, like cycling gear, and soapnuts on everything else.