(Portland, OR)  --  More than four-thousand people volunteered to clean up Oregon during SOLVE's weeklong Spring Cleanup that ended on Earth Day.  There were projects across Oregon and in Southwest Washington.  Nearly 22-thousand pounds of litter and marine debris were picked up and almost 22-thousand square feet of invasive plants were removed.  The cleanup started in 1986 as the Oregon Spring Beach Cleanup and has expanded to projects across the region.