Earth Day

Google usually keeps me abreast of notable anniversaries by replacing their usual masthead with some doodle or other.  So yesterday apparently was Earth Day.  A day, according to Google, for "demonstrating support for environmental protection". Sort of "save the planet" stuff then?  So what actually happened?  As far as I can see some countries signed up to a treaty to limit the proliferation of greenhouse gasses, but that seems to be about it.  Symbolic is I think the word, which usually means being seen to do something which doesn't actually involve doing anything.  Or am I getting more cynical in my old age?