The International Year of Biodiversity was in 2010 (option 4). This international event was organized to raise awareness about the importance of biodiversity, the variety of life on Earth. The event aimed to highlight the negative impacts of human activities on biodiversity and to promote actions to conserve and protect it. The year 2010 was declared as the International Year of Biodiversity by the United Nations, and it was a significant milestone for global efforts towards biodiversity conservation. It provided an opportunity for governments, organizations, and individuals to collaborate and take concrete steps to address the challenges faced by biodiversity loss. The year also saw various awareness campaigns, scientific research, and policy initiatives focused on biodiversity conservation.