

A retiree gives unsolicited climate emergency talks on the New York City subway, frequently receiving applause. Now he wants to teach others how to preach their own messages to a crowd.
(Image credit: Ben James for NPR)
A retiree gives unsolicited climate emergency talks on the New York City subway, frequently receiving applause. Now he wants to teach others how to preach their own messages to a crowd.
(Image credit: Ben James for NPR)