When caching, I make it a goal to pick up at least one piece of trash for each cache I find. Sometimes I pick up many more, and sometimes I don't find any. However, I figure it averages out to at least one piece per cache. It's such an easy way to help keep our environment clean...
To qualify for this cache you must participate in a CITO event. This event will show up in your statistics so it can be verified.
Another great thing you could do (but it is NOT a requirement for the cache) would be to pick up at least one piece of trash for each of your next 100 cache finds. So just think about this... If 10 people who signs this log picks up 100 pieces of trash, that is 1000 pieces of trash. If 100 sign, that's 10000 pieces of trash. If 1000 people sign, we're up to 100,000 pieces. Notice how quickly it adds up? Let's all continue to do our part to keep our world clean.