Crash Course on Climate Change

Climate change is the defining operational risk — and opportunity — of this decade. This crash course condenses the essentials into one readable briefing for teams pursuing recognition in Climate Resilience and Green Operations: the science, the numbers, the rules, and the actions that actually move a footprint.

1. Overview

Climate change refers to long-term shifts in temperature and weather patterns. Weather is what happens this afternoon; climate is the statistical pattern across decades. The shift now underway is driven mainly by human activity — burning fossil fuels, deforestation, and industrial processes.

Global average surface temperature has already risen roughly 1.2–1.3°C above pre-industrial levels, and atmospheric CO2 has climbed from about 280 ppm before industrialisation to over 420 ppm today. Natural variability exists — volcanic activity, solar cycles, ocean oscillations — but none of them explain the rate or direction of the warming observed since the mid-20th century. The human fingerprint is unambiguous.

2. The greenhouse effect

1. Solar radiation reaches the Earth. Shortwave energy from the sun passes largely unimpeded through the atmosphere.
2. Some heat is reflected back to space. Bright surfaces — ice, clouds, deserts — bounce energy away. This is the albedo effect.
3. Greenhouse gases trap the rest. CO2, CH4, N2O, HFCs, PFCs, SF6 and ozone absorb outgoing longwave (infrared) radiation and re-emit it in all directions, including back toward the surface.
4. The Earth gets warmer.

The effect itself is natural and necessary: without it, the planet's average temperature would be around −18°C instead of roughly 15°C. The problem is intensity, not existence. More greenhouse gas means more trapped heat, and because CO2 persists in the atmosphere for centuries, today's emissions commit the climate to warming long after the emitting activity stops.

3. Major greenhouse gases

GWP (Global Warming Potential) expresses the warming impact of one kilogram of a gas relative to one kilogram of CO2 over 100 years. The values above follow the IPCC Sixth Assessment Report (AR6): methane is 27.9 over 100 years (29.8 for fossil methane including carbon-cycle feedbacks), nitrous oxide is 273, and N₂O has an atmospheric lifetime of roughly 109 years (±10). Two practical consequences follow:

• Methane is a short-term lever. It is far more potent than CO2 but decays within about a decade, so cutting leaks, flaring and landfill emissions delivers cooling benefits within a single planning cycle.
• Fluorinated gases are tiny in volume and huge in impact. A single kilogram of SF6 leaked from switchgear carries the warming impact of more than 22 tonnes of CO2. Refrigerant management and leak detection are often the fastest, cheapest emissions win available to an industrial site.

4. Causes of climate change

• Burning fossil fuels — coal, oil and gas for electricity, heat and transport; the single largest source of global emissions.
• Deforestation and land use change — removing forests both releases stored carbon and destroys a future sink.
• Transportation emissions — road freight, aviation, shipping and commuting; aviation and shipping are especially hard to abate.
• Industrial processes — cement, steel, chemicals and refrigerants, where emissions come from chemistry itself, not just fuel.
• Waste and landfills — anaerobic decomposition of organic waste generates methane for decades after burial.
• Agriculture and livestock — enteric fermentation, manure management, and nitrogen fertilizer applications.

5. Impacts of climate change

For organisations, these translate into two distinct risk categories: physical risk (assets, people and supply chains exposed to heat, flood, drought and storm) and transition risk (carbon pricing, regulation, technology shifts, and changing customer or investor expectations).

6. Global response and agreements

• UNFCCC (1992) — the framework treaty establishing global cooperation on climate change and the annual COP process.
• Kyoto Protocol (1997) — first legally binding emission targets, applied to developed countries.
• Paris Agreement (2015) — nearly universal commitment to keep warming well below 2°C and pursue 1.5°C, built on nationally determined contributions (NDCs) that ratchet upward every five years.
• Sustainable Development Goals — Goal 13 calls for urgent action to combat climate change and its impacts, alongside goals on clean energy, responsible consumption and life on land and below water.

Downstream of these sit the rules that reach businesses directly: mandatory climate disclosure regimes, carbon border adjustments, product ecodesign rules, and management system standards such as ISO 14001 (environmental management), ISO 50001 (energy) and ISO 14064 (GHG quantification).

7. The carbon budget in one paragraph

Warming is roughly proportional to the cumulative CO2 ever emitted. That makes a finite "carbon budget" for any temperature limit — a few hundred gigatonnes of CO2 remain for a reasonable chance of holding 1.5°C, against annual emissions of roughly 40 Gt. The practical reading: the date of net zero matters less than the area under the curve. Early reductions are worth far more than late ones, and an offset purchased today does not undo a tonne emitted today.

8. Measuring before managing: Scopes 1, 2 and 3

• Scope 1 — direct emissions from sources you own or control: boilers, furnaces, company vehicles, refrigerant leaks.
• Scope 2 — indirect emissions from purchased electricity, steam, heating and cooling.
• Scope 3 — everything else in the value chain: purchased goods and services, upstream transport, business travel, commuting, use of sold products, and end-of-life treatment. For most companies this is 70–90% of the total footprint.

A credible programme follows the same order every time: measure a baseline year, set a science-aligned target, reduce through efficiency and electrification, switch to renewable supply, then use high-quality removals only for the genuinely residual remainder.

9. Renewable vs non-renewable energy

Renewable — solar, wind, hydro, biomass, geothermal. Naturally replenished, low lifecycle emissions, and now the cheapest source of new electricity in most markets. Main challenge: intermittency, addressed through storage, grid flexibility and demand response.

Non-renewable — coal, oil, natural gas and nuclear fuel. Finite, higher pollution (nuclear excepted on carbon, though it carries waste and cost considerations), and the primary contributor to climate change.

10. Actions to combat climate change

• Reduce emissions — clean energy, efficiency upgrades, and a measured, verifiable baseline.
• Sustainable transport — public transport, EVs, carpooling, route and load optimisation.
• Protect forests — afforestation, reforestation, deforestation-free sourcing.
• Reduce, reuse, recycle — design out single-use materials and keep resources in circulation.
• Conserve energy and water — sub-metering and setpoint discipline beat good intentions.
• Climate education and awareness — engage employees, suppliers and customers; behaviour is infrastructure too.

Individual action checklist

• Save energy at home
• Use public transport, cycle or walk
• Reduce meat consumption
• Avoid single-use plastics
• Plant trees and support green initiatives
• Stay informed and inspire others

11. Key terms to remember

From knowledge to recognition

Understanding the science is step one; demonstrating measurable action is what earns credibility. Organisations that can evidence emissions reduction, energy transition, adaptation planning or circular practices are exactly who Ecopulsive recognises.

Explore the Climate Resilience and Green Operations categories, or contact us to nominate your organisation for 2026 recognition.

Think global. Act local. Save today. Secure tomorrow.