I personally don't need anyone, young or old, to explain climate change and the damage we are doing to the environment.
However, I know many people of all ages who simply cannot be bothered reading or hearing anything about it, and who have plenty of good excuses for not doing what they could to change things.
So, yes, we do need people who are willing and able to fight that particular fight, and I am very thankful to Greta Thunberg for taking the stand she did, and influencing as many people as she did.
Had I been her age, I would have been out there beside her, even although I in my youth chose other fights than the environmental one - equality between men and women and between different ethnic groups has always been my thing.
My concern for the planet consists mainly of not using things that cause the greatest polution, saving on electricity and water etc.