Exercise: For the sake of people or land?

Which of these things do you think we do for the sake of our fellow human beings and which do we do for the sake of the environment? (or both/neither)

• Keeping the school yard free of litter
• Keeping our room at home tidy
• Saying thank you when someone gives us a present.
• Picking up bottles and place them in a recycling bin
• Taking the rubbish out
• Avoiding stepping on a grave if we are at a cemetery

Cleaning out the fish tank (if we have one)