The biophilia hypothesis states that there is an instinctive bond between human beings and other living systems. It’s a gift to go outside, get fresh air year round and connect with the natural world every day. It sharpens the mind and the senses.
Turning out the lights seems pretty easy to me but maybe it's because my parents constantly told me to do it when I was young. I know I feel like I tell my kids A LOT. I’ve found it does become a habit if done over and over enough times. It's also a quickly forgotten habit- thus the nagging of the children. But it does save energy so it's worth the nagging in my opinion. I’ve read that lighting can count for anywhere between 20-50% of home and/or office energy consumption. I think this number might be a little off with more energy effiecient options available nowadays.