PLogging, PLastics and PEns

PLOGgInG: an incredible activity to get fit and vanish rubbish. Pens, an incredible tool to jot down doodles, and plastic, a miracle material that DOES not break down for up to 500-1000 years.... 1.6 billion disposable pens are thrown away each year. Did you know we used to only use reusable pens and just refilled the ink? Is this a viable solution? What do you think we could do to reduce the amount of pens that end up as pollution?