Top 10: Causes of Global Warming

Global warming is accelerating at an alarming pace, driven by human activity across nearly every sector of the global economy. 

According to the Intergovernmental Panel on Climate Change (IPCC), greenhouse gas concentrations are now higher than at any point in at least 800,000 years, with carbon dioxide levels surpassing 420 parts per million in 2025.

Energy, transportation, manufacturing, buildings and agriculture account for over 80% of all global emissions. 

Mining and construction alone contribute roughly a quarter of industrial CO₂ output, while deforestation removes the planet’s most vital carbon sinks at a rate of 10 million hectares annually. 

With temperatures already about 1.2°C above pre-industrial levels, every sector must accelerate its transition toward low-carbon solutions, and some of the world’s largest companies have initiatives to target impact in these areas.

10. Mining

Initiative: Low-carbon steelmaking

Company: Rio Tinto

HQ: London, United Kingdom

CEO: Simon Trott

Mining operations are among the biggest industrial sources of greenhouse gas emissions, driven by fossil-fuel-powered machinery and energy-intensive extraction processes. From coal to precious metals, mining contributes both direct carbon emissions and environmental degradation. 

Rio Tinto, one of the world’s largest mining firms, is rethinking its entire process chain with BioIron ,a low-carbon method of iron production using biomass instead of coal. The company is investing in renewable energy and electrified equipment across its sites to reduce emissions. Sustainable mining has now become central to keeping industrial progress aligned with net zero targets.

9. Construction

Initiative: Low-carbon concrete

Company: Holcim Group

HQ: Zug, Switzerland

CEO: Miljan Gutovic

The construction industry accounts for a major share of global greenhouse gas emissions, largely due to energy-hungry cement production and heavy machinery powered by fossil fuels. 

Concrete alone is responsible for around 8% of global CO₂ emissions. 

Holcim has developed ECOPact, a low-carbon concrete that significantly reduces embodied carbon in infrastructure projects. Combined with innovations in circular construction and waste reuse, this strategy places the company at the forefront of building-sector decarbonisation. 

As cities expand, low-carbon construction solutions will be vital for balancing growth with climate responsibility.

8. Deforestation

Initiative: Right Now Climate Fund

Company: Amazon

HQ: Seattle, US

CEO: Andy Jassy

Deforestation remains one of the most damaging drivers of global warming, releasing vast amounts of stored carbon and weakening nature’s capacity to absorb emissions. 

Around 10 million hectares of forest disappear each year as land is cleared for agriculture and livestock. 

Amazon’s Right Now Climate Fund invests hundreds of millions in forest restoration and conservation projects worldwide, including efforts to rehabilitate degraded tropical ecosystems. 

By funding reforestation and supporting agroforestry, Amazon aims to counterbalance delivery-related emissions and promote more sustainable land use – a critical step in protecting global biodiversity and stabilising the climate.

7. Transportation

Initiative: Electrification of transport

Company: Tesla

HQ: Austin, US

CEO: Elon Musk

Transport accounts for roughly a quarter of all energy-related CO₂ emissions, with most vehicles still reliant on petrol, diesel and other fossil fuels. 

Road traffic is the primary source, but aviation and shipping are growing contributors. Tesla’s push toward vehicle electrification has transformed the global mobility landscape, proving that cleaner alternatives can also be high-performance and profitable. 

The expansion of EV infrastructure, including gigafactories and charging networks, supports the broader green transition. As electric vehicles gain mainstream adoption, the decarbonisation of transport becomes increasingly achievable.

6. Buildings

Initiative: EcoStruxure Building Solution

Company: Schneider Electric

HQ: Rueil-Malmaison, France

CEO: Olivier Blum

Buildings consume nearly 60% of global electricity and contribute heavily to carbon emissions from heating, cooling and lighting. 

Schneider Electric is leading the shift toward intelligent, energy-efficient infrastructure through its EcoStruxure Building platform, which optimises energy use and integrates renewable sources. 

By improving building management systems and leveraging IoT-enabled controls, the company helps reduce emissions without compromising occupant comfort. 

Retrofitting existing real estate with smart energy solutions is now seen as one of the fastest ways to cut urban carbon footprints.

5. Food Production

Initiative: Regenerative Agriculture Programme

Company: Unilever

HQ: London, United Kingdom

CEO: Fernando Fernandez

Food production – from livestock farming to fertiliser use – generates substantial emissions of methane, CO₂ and nitrous oxide. 

Agricultural expansion drives deforestation and the global food system accounts for one-third of all greenhouse gases. 

Unilever is tackling the problem through regenerative agriculture, supporting farmers to restore soil health, protect biodiversity and reduce fertiliser dependency. The company’s long-term goal is to make sustainable agriculture the default across its supply chain.

4. Manufacturing

Initiative: Siemens Xcelerator

Company: Siemens

HQ: Munich, Germany

CEO: Roland Busch

Manufacturing creates vast emissions from energy-intensive processes such as steelmaking, cement and electronics production. Siemens is advancing industrial decarbonisation with its Siemens Xcelerator platform, using digital twin technology and automation to optimise energy efficiency and eliminate waste.

The company helps manufacturers transition towards electrified and hydrogen-based production lines. As industries race toward net zero targets, digitalisation and renewable integration represent key enablers for a cleaner manufacturing future. Siemens’ approach demonstrates how innovation can reconcile industrial growth with environmental stewardship.

3. Waste and Pollution

Initiative: Circular Economy and Waste Recovery

Company: Veolia

HQ: Paris, France

CEO: Estelle Brachlianoff

Waste management contributes to global warming through methane emissions from landfills and energy-intensive disposal methods. 

Veolia leads the global shift toward circularity by turning waste into resources – capturing biogas, recycling materials and promoting sustainable urban systems. Its strategy focuses on recovering energy and materials that would otherwise be lost, closing the loop for industries and cities alike. 

By reimagining waste as a valuable asset, Veolia shows how resource efficiency can be a cornerstone of emissions reduction and ecological progress.

2. Over-consumption

Initiative: Worn Wear and “Earth is Our Only Shareholder” model

Company: Patagonia

HQ: Ventura, US

CEO: Ryan Gellert

Over-consumption lies at the heart of climate change, with affluent lifestyles and endless consumer demand driving emissions from production, transport and waste. 

Patagonia has built its brand around a radical alternative – consuming less. Through its Worn Wear programme and its decision to transfer ownership to a trust directing profits toward environmental causes, Patagonia promotes circular consumption and long-term product lifespan. 

Its message is clear: addressing climate change requires not only cleaner production but also cultural change in how we value and use material goods.

1. Fossil Fuel Power Generation

Initiative: Renewable energy

Company: Ørsted

HQ: Fredericia, Denmark

CEO: Rasmus Errboe

Electricity generation from coal, oil and gas remains the single largest source of global greenhouse gas emissions. 

Ørsted has transformed from one of Europe’s most fossil-fuel-dependent energy companies into a leading force in offshore wind and renewable power. By committing to phase out coal entirely and invest exclusively in clean energy, Ørsted demonstrates how large utilities can successfully pivot toward sustainability. 

Its projects now power millions of homes with green electricity, making the company a model for corporate energy transition and climate leadership.