The correct answer to this open question is the following.
You did not include the topic of task 3. Without information, we do not what you are referring to.
However, trying to help, we can include some examples as reference.
I have learned that taking care of the environment is one of the most important things to do to protect the earth and my community.
I have realized that pollution is one of the main problems we face today. Air pollution, water pollution, deforestation, and many other human activities are risking the environment in which we live.
What I will do with these learnings is to be the first to set the right example. I am going to start at home. I am going to use the water that I need and not a single drop more. I am going to recycle, and every time I can walk or ride a bicycle, I will do that instead of driving a car.