Why So Hot? Speculating About the Climate Crisis

1 Section 1. The Thought Experiment: Why Is It So Hot?

Something has changed. The numbers don’t lie — and the question is: why?

Consider this: according to climate scientists, the ten hottest years ever recorded have all occurred since 1998. More strikingly, the five hottest years on record have all fallen within the last decade. Hot years are not new — there were warm spells in the 1930s and 1970s — but they are arriving faster, hitting harder, and clustering together in a way that was not seen before the late twentieth century.

In the summer of 2023, sea surface temperatures in the North Atlantic broke records by such a wide margin that scientists described the anomaly as ‘shocking.’ Wildfires swept through parts of southern Europe, Canada, and Hawaii. Glaciers in Greenland and Antarctica have been losing mass at an accelerating rate. Meanwhile, extreme weather events — intense hurricanes, prolonged droughts, catastrophic floods — have become measurably more frequent.

So here is the thought experiment: if you were a scientist looking at this data for the first time, what would you conclude? Is this a natural cycle? A statistical coincidence? Or is something else going on? The data suggests a pattern, but a pattern needs an explanation. Over the course of this page, you will build the language to speculate carefully and precisely about what that explanation might be — using the grammar of cause, consequence, and probability.

Before we go further, let’s make sure the key vocabulary is clear. These terms will appear throughout the page.

2 Section 2. Grammar Focus: Present Perfect Simple and Continuous

You already know the present perfect. But here is where it becomes really powerful: when we talk about the climate, we need to connect past actions to present results. The present perfect simple and continuous are the perfect tools for this.

Think of it this way: the present perfect simple focuses on the result — what has happened. The present perfect continuous focuses on the process — how long something has been going on. Both are essential when we want to link human behaviour over time to the conditions we see today.

3 Section 3. Where Do the Probabilities Lie? The Human Factor

The evidence has been building for decades. But how confident can we be that human activity is the primary driver of the climate crisis? The scientific consensus is clear — and the data is compelling.

For well over a century, industrial societies have been burning fossil fuels — coal, oil, and natural gas — to power factories, vehicles, and homes. This process releases carbon dioxide and other greenhouse gases into the atmosphere. These gases act like a blanket around the Earth: they allow sunlight in but trap heat that would otherwise escape into space. The more of these gases we add, the thicker the blanket becomes.

At the same time, we have been destroying the very systems that absorb carbon. Forests — particularly tropical rainforests — function as enormous carbon sinks, drawing CO₂ out of the air and storing it in trees and soil. Since the mid-twentieth century, we have cleared vast areas of forest for agriculture, mining, and urban development. The Amazon rainforest alone has lost approximately 17% of its total area in the last fifty years. As a result, the atmosphere has been accumulating CO₂ faster than natural systems can remove it.

Oceans have also been absorbing both heat and carbon dioxide at an unprecedented rate. Ocean acidification — the process by which seawater becomes more acidic as it absorbs CO₂ — has already damaged coral reef ecosystems across the tropics. Warmer oceans, in turn, intensify tropical storms and disrupt the weather patterns that billions of people depend on.

The scientific community has reached a strong consensus: the probability that natural factors alone could explain the speed and scale of current warming is extremely low. The Intergovernmental Panel on Climate Change (IPCC) has stated that it is ‘unequivocal’ that human influence has warmed the climate. In other words, the evidence does not merely suggest a link — it establishes one.

This is not a political argument. It is a question of cause and effect, examined through decades of data, satellite observation, ice core analysis, and atmospheric measurement. The causes are well understood. The challenge now is to talk about them — and about solutions — with the precision and confidence that the situation demands.

4 Section 4. Grammar Focus: Modal Perfects — Speculating About Causes

Now we move into the grammar of speculation. You have the facts. You have the data. But science — and everyday thinking — often requires us to say not just what happened, but how certain we are about why it happened. This is where modal perfects come in.

Modal perfects use a modal verb + ‘have’ + past participle. They let us express different degrees of certainty about past events or causes. Think of them as a dial that goes from ‘almost certain’ down to ‘just possible.’ The choice of modal tells your listener exactly where you are on that dial.

5 Section 5. Writing Task: Your Analysis of the Crisis

You have explored the data, the science, and the grammar. Now it is your turn to put it all together. Use what you have learned to write a structured analytical response.

6 Section 6. Recap: What You Have Covered

Well done — you have worked through a genuinely complex topic and built real language skills along the way. Let’s bring it all together.

This page started with a thought experiment: why is the planet getting hotter, and why are extreme weather events becoming more frequent? You explored real data — the clustering of record-breaking temperatures in recent years, the loss of Arctic sea ice, the damage to coral reefs — and used that data as the foundation for careful, evidence-based thinking.

In the grammar sections, you revisited two powerful tools. The present perfect simple (‘temperatures have risen’, ‘we have cleared vast areas of forest’) connects past actions to present results. The present perfect continuous (‘we have been burning fossil fuels’, ‘scientists have been monitoring sea ice’) emphasises that a process has been going on over time — and is often the cause behind the result. Together, these forms let you build a timeline of human impact.

You then added modal perfects to your toolkit. These forms — ‘must have been’, ‘may have been’, ‘might have been’, ‘could have been’ — allow you to express how certain you are about a cause. They are the grammar of scientific reasoning: not guessing, but thinking carefully from evidence to conclusion.

Finally, in the writing task, you put all of this into practice: analysing causes, speculating about links, and suggesting how the situation might be improved.

The language you have practised here is not just useful for talking about climate science. Any time you need to connect past actions to present consequences — in business, in research, in everyday discussion — these structures will serve you well. Keep using them.