3. Energy and Environment

Caused mainly by increased concentrations of greenhouse gases (CO₂, CH₄) from fossil fuel combustion, agriculture, and industrial activities. Impacts: Rising temperatures, melting ice caps, sea level rise, extreme weather events.

Global warming refers to the gradual increase in Earth's average temperature due to an increase in greenhouse gases in the atmosphere. These gases, such as carbon dioxide (CO₂) and methane (CH₄), are primarily released from activities like burning fossil fuels, agricultural practices, and industrial processes. As these gases trap heat in the atmosphere, they lead to various environmental changes: temperatures rise, ice caps begin to melt, sea levels increase, and we experience more extreme weather events.

Think of the Earth as a car parked in the sun. If too many people leave the windows closed, the car becomes hotter inside because the sunlight can't escape. Similarly, gases like CO₂ trap heat close to Earth's surface, which makes the planet get warmer over time.

Result from industrial emissions of sulfur dioxide (SO₂) and nitrogen oxides (NOₓ), which react with water vapor in the atmosphere to form sulfuric and nitric acids. Effects: Acidification of soils and water bodies, damage to buildings, forests, and aquatic systems.

Acid rain is caused when sulfur dioxide (SO₂) and nitrogen oxides (NOₓ) are released into the atmosphere through industrial emissions and the burning of fossil fuels. These pollutants can react with water vapor to form acids, which then fall to the ground as rain. This acidification can lead to adverse effects on the environment, including damaging soil and water quality, harming plants and trees, and harming aquatic life in rivers and lakes.

Imagine you spill a bit of vinegar on a plant; over time, that plant might not thrive due to the acidity. Similarly, when acid rain falls, it acts like that vinegar, harming plants, trees, and even the structures we build.

Triggered by the release of chemicals like chlorofluorocarbons (CFCs) and other ozone-depleting substances. Consequences: Increased UV radiation at the Earthʼs surface, leading to human health risks (skin cancer, cataracts) and ecological harm.

The ozone layer is a protective layer in Earth’s atmosphere that absorbs most of the sun's harmful ultraviolet (UV) radiation. However, substances such as chlorofluorocarbons (CFCs) can break down ozone molecules, depleting this layer. As the ozone layer gets thinner, more UV radiation reaches the Earth's surface, which can increase the risk of skin cancer and cataracts in humans and can also harm ecosystems.

Think of the ozone layer like a sunscreen for the planet. Just as sunscreen protects your skin from harmful UV rays, the ozone layer protects Earth. If you don't apply enough sunscreen or if it wears off, you risk sunburn and skin damage; similarly, a depleting ozone layer increases the risk of harmful UV exposure.