Causes of Climate Change

Short-wave Radiation: Energy from the sun enters the atmosphere as short-wave radiation, which easily passes through greenhouse gases to reach the Earth's surface.

Long-wave Radiation: The Earth absorbs this solar energy and re-radiates it as long-wave radiation (infrared heat).

Absorption and Re-emission: Greenhouse gases like $\text{CO}_2$ and $\text{CH}_4$ absorb this outgoing long-wave radiation and re-emit it in all directions, including back toward the Earth, effectively trapping heat in the lower atmosphere.

Fossil Fuel Combustion: The burning of coal, oil, and gas for energy and transport accounts for nearly 50% of global emissions, releasing massive amounts of $\text{CO}_2$.

Agriculture: Livestock farming (cattle) and rice cultivation are major sources of Methane ($\text{CH}_4$), while the use of artificial fertilizers releases Nitrous Oxide ($\text{N}_2\text{O}$).

Deforestation: Trees act as carbon sinks by absorbing $\text{CO}_2$ during photosynthesis; clearing forests reduces this absorption capacity and often releases stored carbon if the wood is burned.

Industrial Processes: The manufacturing of materials like cement involves chemical reactions (e.g., heating limestone) that directly release $\text{CO}_2$ into the atmosphere.

Terminology Precision: Always distinguish between the 'greenhouse effect' (natural) and the 'enhanced greenhouse effect' (human-induced) in written responses.

Gas Identification: Be prepared to link specific gases to their sources, such as $\text{CH}_4$ to agriculture/landfills and $\text{N}_2\text{O}$ to fertilizers.

Volcanic Misconception: Remember that while volcanoes release $\text{CO}_2$, their primary short-term climatic effect is cooling due to ash and aerosols blocking solar radiation.

Orbital Cycles: Use the term 'Milankovitch Cycles' when discussing natural, long-term climate shifts over thousands of years.