Young people are easy targets for predators.
The are a captive audience in schools, where they can be forced to watch blatantly false propaganda like Al Gore’s movie.
Young people also have no memory of climate or weather, and can be convinced that the world never used to have floods, droughts, hurricanes, tornadoes, heat or cold. They trust their teachers and other adults.
The Soviet Union kept control of their population by making sure that the schools presented only the party line. Just like the current US and UK school systems.