Greta Thunberg is being used as a catspaw by unscrupulous, single issue lobbyists who are the equivalent of seventeenth century Puritans. They know they can attack anyone who criticises her as she is autistic and, ostensibly, a little girl.
The child, like many of the modern snowflake generation, wishes to tell her elders and betters what to do on the basis of selective information, no context, prejudiced education, no life experience, under the influence of flattery and manipulation of others and no responsibility for the consequences of her actions. In addition, she has never had to keep herself, live independently, pay taxes to support the state or others or do anything self sacrificing.
The idea that we should be listening to a child who will, in all probability, never be able to live alone, is ludicrous.