I can barely knock out five laps in my swimming pool. I can’t imagine swimming 1,000 miles through all of the crap floating off the east coast. That’s exactly what Christopher Swain is up to. To promote sustainability, he’s doing the crawl from Massachusetts to Washington D.C. through an Atlantic Ocean filled with industrial chemicals, heavy metals, oil slicks and raw sewage. OnĀ  his environmental swim-about, he’ll be helping students in overĀ  2,000 classrooms launch projects designed to improve the…