'You are one of the people Greta Thungerg was attacking in her address to the UN.'

Thanks for the compliment Mr Opinion. She obviously never got a spanking as a child. A spoilt privileged brat with a victim status bigger than her ego.

Dear runner,

Someone had to tell the world what you are. Just happens it came from the mouth of a young girl who is representative of how the younger generation of the world feel about people like you.

Only a fool, or a sociologist could take seriously the opinion of a still wet behind the ears school girl, who needs a couple of decades of experience to learn which way is up.

Dear Hasbeen,

Unfortunately for you, she is right and you are wrong. Plus you are what one would call an environmental criminal and she is not.

what one would call an environmental criminal
Mr Opinion,
You really suffer badly from perception distortion. An environmental criminal is one who condemns another for producing the commodities the criminal demands & uses, the production of which contributes to pollution !
Hypocrite is actually a more apt term & you are one perfect example ! Perhaps you're not of a criminal disposition but your ignorance definitely borders on criminal !

Dear individual,

You too are one of those that Thunberg was attacking: an environmental criminal. Turning a blind eye to environmental degradation and species extinction makes you just as guilty as the actual culprit.