În 2021, cercetătorii finlandezi au aruncat 1.500 de brazi de Crăciun într-un lac. Trei ani mai târziu, zona a devenit de nerecunoscut

In 2021, Finnish researchers submerged 1,500 Christmas trees in Lake Saimaa to study their impact on aquatic life. Three years later, they observed a significant increase in benthic organisms and fish populations around the submerged trees. The experiment demonstrated how discarded Christmas trees can enhance underwater biodiversity by providing shelter and food for aquatic species. However, the study emphasized that such actions should be conducted under controlled conditions, rather than randomly disposing of trees in lakes.