In my regular blog reading, there has been a lot of talk about green-washing, and corporations co-opting Earth Day to sell more products, knick-knacks and other stuff that may or may not actually be green. (If you click on most of the blogs with "Green" in the title to the right, then you'll probably find at least one that is or has talked about this.)
As an optimist, though, I'm going to focus on the fact that it is the 40th anniversary of Earth Day. That means that for 40 years, caring for our Earth has been a mainstream idea, and not just the idea of a few kooks on the fringe. That means that while there are climate change deniers, or those who just don't that humans have caused or impacted climate change, there are many, many others who are actively working to reduce their own carbon footprint and trying to make green-living attainable.
And don't forget that every day is Earth Day! ;)