Yesterday I went to Greenfield to hear a talk by the charming Ed Himlan of the Massachusetts Watershed Coalition talk about rain gardens, but we didn't have to stand out in the rain to enjoy it and learn. Did you know that the major cause of pollution in our waterways is from rainwater runoff?  More on that later. During my drive about town I admired the forsythia in bloom everywhere. It hurts me to see bushes pruned severely…