Understanding climate change in simple terms: what every executive, HR director, and manager absolutely needs to know

Climate change is often seen as a complex scientific issue, reserved for specialists or environmental managers in large companies. Yet its implications are now so profound that no executive, HR director, or manager can afford to ignore it. It already shapes—and will increasingly shape—markets, regulations, employee expectations, and operational risks. Understanding a few key concepts, without going into all the technical details, is therefore essential for guiding strategic and managerial decisions.

Climate change essentially results from the increase in the concentration of greenhouse gases in the atmosphere, particularly carbon dioxide (CO₂), but also methane, nitrous oxide, and a few others. These gases trap part of the infrared radiation emitted by the Earth, causing global warming. Since the industrial revolution, the burning of fossil fuels (coal, oil, gas), deforestation, and certain agricultural practices have caused a rapid increase in these concentrations. Average global temperatures have already risen by around 1.1 to 1.3°C compared with the pre-industrial era.

This average increase masks significant variations depending on regions, seasons, and extreme events. In practical terms, climate change is reflected in more frequent heatwaves, more intense droughts in some areas, heavier rainfall in others, rising sea levels, ocean acidification, and ecosystem disruption. For businesses, these phenomena translate into multiple risks: shortages of certain resources (water, raw materials), damage to infrastructure, supply chain disruptions, impacts on workers’ health (especially in cases of extreme heat), and increased social tensions in certain regions.

International agreements such as the Paris Agreement aim to limit warming to well below 2°C, and preferably to 1.5°C, above pre-industrial levels. To achieve this, greenhouse gas emissions must be drastically reduced worldwide by transforming our energy systems, transport methods, industrial processes, agricultural practices, and consumption patterns. States are gradually adopting legislation in this direction; financial markets, customers, and employees are also holding companies accountable. Climate transition is therefore not just a matter of conviction, but a structuring movement in the socio-economic environment.

For an executive or manager, three questions arise: how does our company currently contribute to climate change? How will it suffer the consequences? And how can it adapt and act to reduce its footprint while ensuring its economic sustainability? The first question relates to the emissions linked to the company’s activities: energy consumption on sites, business travel, production of goods or services, procurement, logistics, and the use and end-of-life of products. This is what is referred to as Scopes 1, 2, and 3 of greenhouse gas emissions.

The second question, concerning impacts, invites us to look at physical climate risks: site exposure to floods, fires, or heatwaves; dependence on vulnerable resources (water, certain raw materials); fragility of certain infrastructure. It also invites us to consider so-called “transition” risks: regulatory changes (carbon tax, bans on certain products or processes), shifts in demand (customers turning to lower-impact offers), and reputation (brand image associated with a sector perceived as polluting).

Finally, the third question opens up the levers for action. Reducing a company’s carbon footprint is not just about offsetting emissions through external projects. It first involves energy sobriety (using less), efficiency (providing the same service with less energy or fewer resources), the gradual replacement of fossil fuels with renewable or low-carbon energy, eco-design of products, relocation or reorganization of certain value chains, and the promotion of lower-carbon mobility. These transformations have direct consequences for work organization, skills, industrial strategy, and procurement policy.

HR has a central role to play in this transition. HR must anticipate changes in jobs, the need for new skills (energy efficiency, life-cycle analysis, new processes, maintenance of low-carbon technologies), and the social impacts of certain decisions (site closures, sector reconversion, job transformations). HR is also on the front line in helping employees understand these issues, so that climate is not perceived as a distant topic disconnected from their daily reality, but rather as a structuring element of the company’s overall project.

Understanding climate change in simple terms, for an executive or manager, therefore means accepting the need to look beyond the immediate horizon. It means integrating into today’s decisions the likely consequences of tomorrow, in terms of both risks and opportunities. It also means recognizing that the company’s credibility, in the eyes of both customers and employees, depends on the consistency between its words and its actions on this subject. Without becoming a climatologist, every person involved in governance can grasp these basic concepts in order to better guide strategy in a world undergoing transition.