Solution:Major environmental problems globally include air and water pollution, ozone layer depletion, global warming, and climate change. Air pollution occurs when pollutants in the air exceed safe limits and become harmful to humans, animals, buildings, or other materials.
The main sources of air pollution include moving vehicles, industries, construction sites, and mines, fires, natural processes and events (such as fireworks during festivals and celebrations). Global warming refers to an increase in the Earth's average surface temperature, while climate change refers to long-term changes in the Earth's climate or the climate of any region of the Earth. Global warming refers to an increase in temperature alone, while climate change includes warming as well as the adverse effects of warming, such as melting glaciers, heavy rainfall, storms, and frequent droughts.
The ozone layer is essential for life on Earth because it absorbs most of the sun's harmful ultraviolet-B (UV-B) radiation. When the ozone layer is depleted, UV-B radiation reaches the Earth, causing problems such as skin cancer, cataracts, climate change, etc. Therefore, option (a) is correct.