The Greenhouse Effect, Global Emissions, and Human Environmental Impact

Comprehensive vocabulary flashcards covering the natural and enhanced greenhouse effect, global warming potential of key gases, sectoral drivers of emissions, agricultural practices, deforestation dynamics, and energy statistics.

Greenhouse Effect

The natural process where gases in Earth's atmosphere trap heat radiated from the planet's surface, acting like a blanket to keep the planet warm enough to support life.

Enhanced Greenhouse Effect

The disruption of Earth's climate equilibrium caused by human activities releasing additional greenhouse gases, which trap excessive heat, raise global temperatures, and drive global warming and climate change.

Enteric Fermentation Process

The digestive mechanism in ruminant livestock consisting of four steps: (1) consuming plant feed, (2) microbial fermentation producing fatty acids, $\text{CO}_2$, and $\text{H}_2$, (3) methanogens converting $\text{CO}_2$ and $\text{H}_2$ into $\text{CH}_4$, and (4) eructating (burping) methane into the atmosphere.

Ruminant Animals

Herbivorous mammals (such as cattle and sheep) possessing multi-chambered stomachs that swallow plant material and regurgitate it as cud to continue chewing.

Carbon Sink

A natural reservoir—such as forests, soils, or oceans—that absorbs and stores carbon dioxide taken out of the atmosphere over extended periods.

Sustainable Forestry Cycle

A forest management model balancing harvesting and regrowth across life stages (seedling/sapling, small tree, medium tree, and large tree) through thinning, replanting, and converting timber into long-term wood products to preserve carbon-storing capacity.

Deforestation

The permanent clearance and conversion of forested lands by human activities, such as agricultural expansion, logging, mining, and urbanisation, accounting for approximately $11\%$ of global greenhouse gas emissions.

Forest Carbon Flux Dynamics

The ecological balance where intact and regrowing forests act as net carbon sinks by sequestering atmospheric $\text{CO}_2$, whereas clearing, burning, and converting forests into agricultural or urban land releases stored biomass carbon and creates ongoing emissions.

Gross Forest Removals

The annual quantity of atmospheric $\text{CO}_2$ sequestered by expansive national forest biomes; the top $10$ nations (led by Russia, Brazil, and the United States) accounted for $62\%$ of global forest removals between 2001 and 2024.

Building Energy Rating (BER)

An energy efficiency grading scale for residential and commercial structures from A1 down to G; in Ireland, approximately $80\%$ of homes and buildings are rated C or worse, causing significant thermal energy loss through space heating.

Methane ($\text{CH}_4$) Warming Potency

A relative global warming measurement indicating that $1\,\text{kg}$ of methane is $25\times$ more potent at trapping heat in the atmosphere than $1\,\text{kg}$ of carbon dioxide ($\text{CO}_2$).

Nitrous Oxide ($\text{N}_2\text{O}$) Warming Potency

A relative global warming measurement indicating that $1\,\text{kg}$ of nitrous oxide is $265\times$ more potent at trapping heat in the atmosphere than $1\,\text{kg}$ of carbon dioxide ($\text{CO}_2$).

Urbanisation

The process of rapid population migration and structural growth into urban centers; while occupying only $3\%$ of ice-free land, urban settlements generate nearly $70\%$ of global $\text{CO}_2$ emissions.

Liming

An agricultural soil amendment practice of spreading ground limestone to neutralize soil acidity and improve fertility, which directly releases carbon dioxide ($\text{CO}_2$) into the atmosphere.

Protected Urea

A chemically treated nitrogen fertilizer formulation designed to suppress gaseous losses, thereby mitigating agricultural emissions of both nitrous oxide ($\text{N}_2\text{O}$) and ammonia ($\text{NH}_3$).

Manure Management

The handling, storage, and land spreading of animal dung and slurry, which generates substantial emissions of both methane ($\text{CH}_4$) and nitrous oxide ($\text{N}_2\text{O}$).

Fossil Fuels

Non-renewable hydrocarbon fuels (coal, crude oil, natural gas, and peat) that supply approximately $80\%$ of global energy, contributing over $75\%$ of all greenhouse gases and nearly $90\%$ of global $\text{CO}_2$ emissions.

Data Centre Metered Electricity Consumption (Ireland)

The power utilized by server hardware and cooling facilities across Ireland's $58$ data centres, which grew from $5\%$ of national metered electricity in 2015 to $21\%$ in 2023.

Vehicle Emission Factors (Petrol vs. Diesel)

The metric of direct automotive combustion emissions: burning $1\,\text{litre}$ of petrol emits $2.3\,\text{kg}$ of $\text{CO}_2$ ($2.5\,\text{tonnes}$ annually for an average Irish car), while burning $1\,\text{litre}$ of diesel emits $2.64\,\text{kg}$ of $\text{CO}_2$ ($2.14\,\text{tonnes}$ annually).

2024 Tropical Primary Forest Loss Drivers

A historic shift in deforestation patterns where wildfires overtook permanent agriculture as the primary cause of tropical primary forest loss, accounting for $49.5\%$ compared to $29.1\%$ for agriculture.

Cork City Greenhouse Gas Profile

An urban emissions breakdown totalling $985.7\,\text{ktonnes}$ of $\text{CO}_{2,\text{eq}}$ per annum, dominated by households ($34\%$), road transport ($29\%$), and commercial/industrial operations ($22\%$).