An environmental disaster is a catastrophic event that causes significant damage to the environment, ecosystems, and human health. Examples of environmental disasters include oil spills, chemical leaks, deforestation, natural disasters such as hurricanes and tsunamis, and nuclear accidents. These disasters can have wide-ranging and long-lasting effects on the environment, including pollution of water and air, destruction of habitats, loss of biodiversity, and contamination of soil and water sources. They can also have serious implications for human health, leading to respiratory problems, waterborne diseases, and other health issues. Preventing environmental disasters requires proactive measures such as proper waste management, sustainable land use practices, and emergency preparedness planning. When disasters do occur, it is important to respond quickly and effectively to minimize their impact and restore the affected areas as much as possible.

Ecocide is the extensive damage, destruction, or loss of ecosystems and natural resources due to human activities. It is considered a severe form of environmental degradation and can have long-lasting and far-reaching consequences for both the environment and human populations. Examples of ecocide include deforestation, oil spills, and pollution of waterways. Some activists and legal experts have called for the recognition of ecocide as a crime under international law.

Leonardo DiCaprio has been involved with the United Nations for several years, particularly in the realm of environmental conservation and climate change. In 2016, he was designated as a UN Messenger of Peace with a focus on climate change issues. DiCaprio has also spoken at various UN events, including the UN Climate Summit and the signing of the Paris Agreement. He has used his platform as a celebrity to raise awareness about the importance of protecting the environment and taking action to address climate change.