Climate Change Mitigation: Key Strategies to Reduce GHG Emissions

Global temperatures have already risen by roughly 1.2°C above pre-industrial levels, and every fraction of a degree of additional warming brings greater risks – stronger storms, more severe droughts, accelerating sea-level rise, and ecosystem collapse. The core question now is not whether climate change is happening, but what we can do to slow it down. That is precisely what climate change mitigation is about: taking deliberate action to reduce the greenhouse gases (GHGs) that are driving the warming of our planet.

What is climate change mitigation? 🔗

According to the UNDP, climate change mitigation refers to any action taken by governments, businesses, or individuals to reduce or prevent the emission of greenhouse gases, or to enhance the natural systems – called carbon sinks – that remove these gases from the atmosphere. Forests, oceans, and soil all act as carbon sinks, absorbing CO₂ that would otherwise accumulate in the atmosphere.

NASA describes the goal of mitigation as avoiding significant human interference with Earth’s climate – stabilizing greenhouse gas levels in a timeframe that allows ecosystems to adapt, keeps food production secure, and enables sustainable economic development to continue. In practical terms, this means reducing the flow of heat-trapping gases into the atmosphere from their main sources: power plants, factories, vehicles, and farms.

It’s important to distinguish mitigation from adaptation, which refers to adjusting to the climate impacts that are already underway. Both are necessary, but mitigation is what determines how severe those future impacts will be. MIT’s Climate Portal explains it well: mitigation works to make future climate change as mild and manageable as possible, while adaptation deals with the changes we fail to prevent.

Why the urgency? 🔗

The science is unambiguous. The IPCC has warned that global GHG emissions must peak before 2025 at the latest and decline by 43% by 2030 to maintain a credible chance of limiting warming to 1.5°C. Current policies, however, are far from sufficient – projections suggest they put the world on track for roughly 2.7°C of warming by 2100, well above what scientists consider a safe threshold. This gap between what is needed and what is being done makes mitigation one of the most urgent priorities in global environmental policy today.

Major approaches to climate change mitigation 🔗

There is no single solution to reducing global GHG emissions. Instead, mitigation draws on a portfolio of strategies spanning energy, land use, industry, transport, and individual behaviour. The University Corporation for Atmospheric Research (UCAR) frames it clearly: we need to both stop adding greenhouse gases to the atmosphere and increase the Earth’s capacity to pull them out.

Transitioning to renewable energy 🔗

Nearly three-quarters of human-caused GHG emissions come from burning fossil fuels – coal, oil, and natural gas – for electricity, heat, and transport. Replacing these with clean alternatives is therefore the single most impactful mitigation lever. Renewable energy sources such as solar, wind, geothermal, hydropower, and tidal energy generate electricity without releasing GHGs into the atmosphere. The cost of these technologies has fallen dramatically over the past decade, making them increasingly competitive with fossil fuels. A few countries, including Iceland and Costa Rica, now source nearly all their electricity from renewables – demonstrating that a clean grid is not just a distant aspiration.

Improving energy efficiency 🔗

Cutting how much energy we use in the first place is just as important as changing where that energy comes from. Buildings, transport systems, and industrial processes all offer significant scope for efficiency gains. Simple measures – LED lighting, better insulation, smart thermostats, and low-flow water fixtures – can meaningfully reduce electricity demand. At a larger scale, expanding public transit is a powerful tool: research from the World Resources Institute (WRI) shows that buses and trains can reduce GHG emissions by up to two-thirds per passenger per kilometre compared to private vehicles. The European Environment Agency (EEA) reports that the EU reduced its primary energy use by 19% between 2005 and 2023 – a significant achievement driven by efficiency improvements across sectors.

Sustainable land use and forestry 🔗

Forests are natural carbon sinks – they absorb CO₂ from the atmosphere as they grow. When forests are cleared, not only is that carbon storage capacity lost, but the carbon held in trees is released back into the atmosphere. According to Wikipedia’s synthesis of IPCC data, reducing deforestation – particularly in tropical regions – has a mitigation potential of 4.2 to 7.4 gigatonnes of CO₂ equivalent per year. Protecting and restoring forests, wetlands, peatlands, and grasslands is therefore a critical and cost-effective part of any mitigation strategy.

Changing agricultural practices and consumer behaviour 🔗

Agriculture accounts for a significant share of global emissions, largely through livestock farming. As cattle digest food, they release methane – a greenhouse gas far more potent than CO₂ over a short time horizon – and their manure emits both CO₂ and nitrous oxide. UCAR notes that if half the global population shifted to a plant-rich diet by 2050, it could keep approximately 65 gigatons of CO₂ out of the atmosphere over 30 years. Reducing food waste is equally impactful, with the potential to save around 90 gigatons of CO₂ from reaching the atmosphere over the same period.

Consumer behaviour more broadly plays a role too. Reducing unnecessary purchases, choosing secondhand goods, driving less, flying less, and composting food waste are all actions that, at scale, contribute meaningfully to reducing emissions. Research published in Environmental Research Letters found that behavioural and lifestyle changes – including shifting consumption patterns and improving urban design – could collectively reduce global GHG emissions by up to 40-70% by mid-century.

Carbon pricing and policy tools 🔗

Beyond technology and behaviour, effective mitigation also requires policy frameworks that make it financially rational to reduce emissions. Two of the most widely used tools are carbon taxes and cap-and-trade systems. A carbon tax places a direct price on GHG emissions, incentivising businesses and consumers to shift to cleaner alternatives. A cap-and-trade system sets an overall emissions ceiling and allows companies to buy and sell emission allowances within that cap, driving reductions where they are cheapest. The Environmental and Energy Study Institute (EESI) explains that both approaches force emitters to account for the true environmental and social costs of their GHG emissions – costs that markets would otherwise ignore.

Global initiatives and agreements 🔗

Mitigation cannot succeed if countries act in isolation. Climate change is inherently a global problem, and tackling it requires coordinated international action. The most significant framework for this cooperation is the Paris Agreement, adopted in December 2015 at the UN Climate Change Conference (COP21) in Paris.

The Paris Agreement 🔗

According to the United Nations, the Paris Agreement’s central aim is to limit global average temperature rise to well below 2°C above pre-industrial levels, while pursuing efforts to limit the increase to 1.5°C. It represents a historic shift: for the first time, both developed and developing nations committed to taking climate action, with the agreement covering nearly every country on Earth.

The agreement operates on a five-year cycle of increasingly ambitious commitments. Each country is required to submit a Nationally Determined Contribution (NDC) – a national climate plan outlining how it will reduce its GHG emissions and build resilience to climate impacts. The UNFCCC explains that each successive NDC must represent a progression beyond the previous one and reflect the highest possible level of ambition. Countries also commit to transparency, regularly reporting on their emissions and progress toward their targets.

Nationally Determined Contributions (NDCs) in practice 🔗

The UNDP’s Climate Promise programme notes that 100% of the NDCs it has supported include energy targets or policies, while 90% cover the agriculture sector – reflecting how broadly the NDC framework reaches across economies. Some countries have made notable commitments: Japan has set a target to cut emissions by 60% from 2013 levels by 2035, while Brazil has committed to reducing its emissions by 59-67% below 2005 levels by the same year.

However, the UN is clear that current NDC commitments collectively fall well short of what is needed to limit warming to 1.5°C. Existing plans and policies put the world on track for 2.6-3.1°C of warming – a gap that makes the next round of NDCs, to be submitted ahead of COP30 in Belém, Brazil in November 2025, critically important. In 2025, the US also withdrew from the Paris Agreement under executive order, creating a significant gap in global climate leadership that other major economies will need to fill.

Finance, technology, and equity 🔗

The Paris Agreement also addresses the stark inequalities in both the capacity to mitigate and the vulnerability to climate impacts. Under Articles 9, 10, and 11, developed nations commit to providing financial support to developing countries for both mitigation and adaptation – recognising that wealthier nations bear far greater historical responsibility for accumulated GHG emissions. Technology transfer and capacity building are also integral to the framework, ensuring that lower-income nations are not left behind in the global transition to low-carbon economies.

The road ahead 🔗

Climate change mitigation is not a single action or policy – it is a comprehensive transformation of how the world produces energy, grows food, designs cities, and makes consumption choices. The tools exist: renewable energy is increasingly affordable, forests can be protected, efficiency can be improved, and carbon can be priced. What is needed is the political will, international cooperation, and financial commitment to deploy these tools at speed and scale. As the EEA puts it, reducing and avoiding emissions requires reshaping everything – from how we power our economies to how we travel, eat, and live.

What do you think? Given that current NDC commitments still fall short of the 1.5°C target, where do you think the greatest barrier to more ambitious global climate action lies – in technology, political will, or economic systems? And if demand-side behavioural changes could reduce global emissions by up to 70% by mid-century, why do you think individual and collective behaviour change remains so underemphasised in climate policy?

References

1. https://climatepromise.undp.org/news-and-stories/what-climate-change-mitigation-and-why-it-urgent
2. https://science.nasa.gov/climate-change/adaptation-mitigation/
3. https://climate.mit.edu/explainers/mitigation-and-adaptation
4. https://en.wikipedia.org/wiki/Climate_change_mitigation
5. https://scied.ucar.edu/learning-zone/climate-solutions/reduce-greenhouse-gases
6. https://www.wri.org/insights/strategies-achieve-climate-mitigation-adaptation-simultaneously
7. https://www.eea.europa.eu/en/topics/in-depth/climate-change-mitigation-reducing-emissions
8. https://www.eesi.org/policy/mitigation
9. https://www.un.org/en/climatechange/paris-agreement
10. https://unfccc.int/most-requested/key-aspects-of-the-paris-agreement
11. https://climatepromise.undp.org/news-and-stories/NDCs-nationally-determined-contributions-climate-change-what-you-need-to-know
12. https://www.un.org/en/climatechange/all-about-ndcs