This is the winner!

The image of planet contained inside the light bulb represents the need we have to find a light in life to save it from destruction

The circle of the earth is divided into two parts: the upper part with the grandfather and the green tree symbolizes a healthy world versus the lower part with the grandson and the black tree which is the polluted world. The circle gives the idea of ​​movement and is a symbol of recycling.

Grandparents are telling us how they have preserved life and nature. We are learning good actions 

Our grandparents tell us how we should protect the life on our planet as it is impossible to live without nature. The red arrows symbolize the idea that we are all interconnected.

Our planet,  covered with black continents, is  weeping.The present is in contrapposition with the past symbolized by the postcard that reminds us of a healthy, green planet where people care about the environment. Our grandparents' memories tell us to protect the life on our planet.

The tender image of the grandfather and his grandson walking hand in hand over our planet to be saved represents important feelings of empathy and love. The grandfather is telling him how we can perserve life on our planet