Greenvy

Green.
Envy.
Greenvy.

If you are jealous of your neighbor's gardening prowess, you might say that their green thumb makes your thumb green with envy.

And if so, then that envy-induced greenness should improve your own thumb's gardening ability.

Jealous.
Useful.
Jealouseful.

So while it may be that the grass is always greener, that also makes your jealous thumb greener, which enables you to make your own grass all the more green as well.

Going green has never been easier, powered by jealousy.

Greenvy.
Environment.
Greenvyronment.