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The word environment refers to the surroundings or conditions in which living organisms exist, including the physical, chemical, and biological factors that influence them.

The most serious environmental problems include pollution, deforestation, climate change, loss of biodiversity, and depletion of natural resources. In the text, pollution and climate change are described as serious environmental problems.

Sea water has become dangerous nowadays due to pollution from various sources such as industrial waste, sewage, and oil spills. These pollutants contaminate the water and can harm marine life and ecosystems.

Dumping industrial waste in the sea is dangerous because it introduces harmful chemicals, toxins, and pollutants into the marine environment. This can disrupt the balance of ecosystems, harm marine life, and contaminate seafood consumed by humans.

The Statue of Liberty in New York was damaged due to air pollution. The pollutants in the air, particularly sulfur dioxide, caused corrosion of the statue's copper exterior, leading to its discoloration.

Air pollution in cities mainly comes from various sources such as vehicular emissions, industrial activities, power plants, and burning of fossil fuels. These activities release pollutants into the air, contributing to air pollution in urban areas.

It is not safe to be in direct sunlight in certain places because of the depletion of the ozone layer. The ozone layer acts as a protective shield against harmful ultraviolet (UV) radiation from the sun. In certain areas where the ozone layer is thin or depleted, direct sunlight can increase the risk of sunburn, skin cancer, and other health problems.

Nuclear power stations are considered dangerous due to the potential for accidents and the long-term storage and disposal of radioactive waste. Accidents at nuclear power plants can release harmful radiation into the environment, causing immediate health risks and long-term environmental contamination. Additionally, the safe management of radioactive waste generated by nuclear power plants is a complex and challenging issue.