What is the most common type of environmental problem in the world?

The most common type of environmental problem in the world is pollution. Pollution can be defined as the presence or introduction into the environment of contaminants or substances that cause harm or discomfort to living organisms. The sources of pollution include industrial activities, transportation, agriculture, and waste disposal. The impacts of pollution can be seen in the air we breathe, the water we drink, and the food we eat.

Other major environmental problems facing the world include climate change, deforestation, and biodiversity loss. Climate change is caused by the emission of greenhouse gases, primarily from burning fossil fuels, and is resulting in rising temperatures, changing weather patterns, and rising sea levels. Deforestation is the clearing of forests for commercial or agricultural purposes, leading to habitat destruction and loss of biodiversity. Biodiversity loss is the result of habitat destruction, climate change, pollution, and other factors, and is leading to the extinction of many plant and animal species.