Years ago, before they stopped issuing plastic bags at 7-Eleven, I would always take my own plastic bags. I would say to the cashier NO PLASTIC and pull out my own bags, they would always laugh at me like I was some sort of idiot.
Most days, after I finish my workout I use the gym bathroom, I always wash my hands, do a pee etc. , I never turn on the lights, no need, I'm not reading a book or something, anyway there is a small window that let's light in. The other day security guard comes in and turns all the lights on, then says it's OK to turn lights on.
In Australia we are taught about the environment at a young age, sadly Thailand has other priorities in their schools.