Art installations about environmental protection often use various artistic techniques to raise awareness about environmental issues such as pollution, climate change, and biodiversity loss. These installations can take the form of sculptures, murals, interactive experiences, and digital media. They are designed to engage the public, inspire reflection, and promote environmental conservation. Some well-known examples include the 'Ice Watch' project, which brings melting polar ice to urban centers, and the 'Tree of Life' in Berlin, which visually represents the interconnectedness of all living things.