Make the polenta by boiling the water in a large saucepan over medium-high head. Add in polenta, butter, and salt. Stir constantly for 3 minutes, or until polenta start to thicken.
Reduce heat to low and cover with lid, simmer for 30 minutes whisking every 5-10 minutes.
While polenta cooks, rinse scallops under cold water, then pat dry with a paper towel. Season both sides of scallops with salt and pepper.
Heat butter in a large skillet over medium-high heat, then cook scallops in skillet for about 1-2 minutes per side or until cooked through. Set scallops aside and keep warm.
In that same skillet, make the greens by adding in olive oil and garlic. Cook for 1 minute, then add in fresh greens, lemon juice and zest, a pinch of salt, and black pepper.
Sauté greens until wilted and tender (about 5 minutes), then serve over polenta with seared scallops on top.