Al Gore is a very passionate person who cares about our planet - that's the big ball of Earth that we all live on! He does a lot of things to try and make sure that we don't hurt the planet too much, and one of those things is called "environmental activism".
When people do things that can hurt the planet, it's called pollution. Pollution can be things like throwing trash on the ground, using too much energy, or putting chemicals in the water. When we pollute the planet, bad things can happen like animals getting sick or even dying, and places becoming unsafe for humans to live in.
Al Gore wants to help stop pollution and make sure that people all over the world are taking care of the planet. He talks to people and makes speeches to help them understand how important it is to take care of the Earth. He also tries to convince governments and companies to make laws and policies that help protect the planet.
Al Gore also made a movie called "An Inconvenient Truth" which showed how much damage we are doing to the planet and what we can do to help. This movie helped a lot of people understand how important it is to take care of the Earth, and it was seen by millions of people all over the world.
Overall, Al Gore is a really important person in the fight against pollution and for taking care of our planet. He teaches us to be kind to the Earth, just like we would be kind to a friend or a pet.