Write the following list of characters into a correctly formed sentence: PlanSignistheonlysignsystemintheworldthatisCradletoCradlecertified.In2016,wehavemetevenhigherenvironmentalstandardsandincreasedourcertificationlevelfromBronzetoSilver.
PlanSign is the only sign system in the world that is Cradle to Cradle certified. In 2016, we have met even higher environmental standards and increased our certification level from Bronze to Silver.