It's Earth Day. Down here in the Seattlest news room we thought that, along with giving up meat, disposable coffee cups and plastic bags, we'd offer some unsolicited advice about how you can help the planet the other 364 days of the year, too. But, when a friend who happens to be a real live Seattle native and an inveterate bike commuter approached us with a better idea abut spreading the gospel of bike commuting,......