This man has been in the environmental game for a long time and has learned to handle himself deftly in a crowd. He was speaking to the choir, but I got the feeling he would have been equally adept with group of coal burning utility owners.
For example, he didn't spend a lot of time talking about the climate change. Instead, he focused on the age-old concerns of water and air pollution. Remember those.
He wasn't all doom and gloom. He stated we were making lots of headway in these areas. For example, Los Angeles has four times as many cars on the road as it did in the 1970's, but one-half the pollution. That's progress. He also discussed the rivers that have been cleaned up in the twenty-five years, without negating the work that still needs to be done.