Thanks Lola for your 'Black & White' update - http://activerain.com/blogsview/151924/RendezVous-in-Black-White It caused me to clarify for myself that we've gotten to a consciousness of environmental issues that can no longer be considered 'gray' at all, but in fact are clearly black & white. 
In response, I don't know the scientific terminology & understanding of the various particulates in the air as per tonnage of carbon, etc. The broad term pollution is what I know. I have begun to understand the grave concern for quality of life & affected earth cycles.
My personal concern has caused me to take personal measures. I am fortunate for many reasons to live in the downtown core of Kelowna British Columbia. I can & do walk & cycle to do most of what I need to. I use my vehicle sparingly. I have thought of taking the bus, but haven't gotten that far yet! There are time & efficiency considerations. This is what I can do.
Of grave concern is the fact that money is & will continue to be a factor in determining the world's largest offenders of particulates. Here in Canada, the Alberta Oil Sands, the world's largest resource of fossil fuels, in the wealthiest Canadian province also is in the process of displacing the entire sensitive arboreal landscape of a huge area.
The propaganda publicized in attempt to veer away from the concerns, is the voice of the machine telling us that their plan is on course and nothing will sway it. They are showing us how their efforts will renew the lands to former status.
Leaving my car parked seems so small next to this. But I have to believe in it. I have to believe I have impact. I have to believe we can change.
I have to believe I am cycling for 'Fresh Air'!
Hey Deborah, Kudos to you! I am slowly understanding that it's all about each one of us taking personal responsibility. Changing even just one thing, like walking or cycling the neighborhood rather than just driving to and from one's garage becomes a big thing if each of us is doing our small part. Enjoyed reading your thoughts on this post.