Many human activities harm the environment, including:

Burning fossil fuels: Generating electricity, manufacturing goods, and powering transportation all produce emissions from burning fossil fuels. 

Deforestation: Cutting down forests for agriculture, pastures, or other reasons releases the carbon stored in trees. 

Overfishing: Overfishing in rivers, lakes, and seas can lead to eutrophication, which is excessive plant growth. This can create a cycle that reduces the number of fish available to eat. 

Using aerosol deodorants, throwing batteries in the trash, and other habits: These are some everyday habits that can pollute the environment. 

Tourism: The tourism industry can strain local environments and infrastructure through overcrowding, resource consumption, and development. 

Human migration: Large-scale human migration can put pressure on host environments. 

Ozone depletion: The production of chemicals like chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and halons has contributed to a decrease in the size of the ozone layer. 

Other environmental issues include:

Loss of biodiversity, Air pollution, Ocean health, Water pollution, Overpopulation, Energy use, and Weather events.