Oh, about environmental issues I only know to turn off the light when leaving the home, throw the rubbish in the rubbish bin and save the water (turn off the faucet after using)

When referring to turn off the faucet this topic, it suddens occur to me, my cat likes to drink flowing water and doesn't like to drink dead water, so she always turn on the faucet by herself when she is thirsty. But she only knows how to turn on, doesn't know how to turn off (perhaps she is not willing to do that or she is only too lazy)

回复 @圆环之理：A great volume of water is wasted until we discover the faucet is on

回复 @圆环之理：So because of my cat, we will waste much water (and money) every month

Reply to @Ring Theory: Suggest buy a cat water fountain to let your cat drink  fresh water.

回复 @Omar：We once tried this method, but she is too old and seems to be reluctant to get in touch with new things. She didn't use this fountain at all

Reply to @The Theory of the Circle: That's a pity. I guess you can allow her to turn on the faucet to drink and keep and eye on the cat and faucet.