Is climate change real?

Yes, climate change is real.

There is an overwhelming consensus among the global scientific community that the Earth’s climate is warming rapidly and that human activities are the primary driver of this change. Major scientific organizations worldwide—including NASA, the Intergovernmental Panel on Climate Change (IPCC), and the national academies of science of dozens of countries—agree on this reality. Peer-reviewed studies show that 97% to over 99% of actively publishing climate scientists agree that human-caused climate change is occurring.

Here is a breakdown of how we know climate change is real, what is causing it, and the evidence supporting it.

1. What Is Causing It?

While the Earth's climate has changed naturally over its 4.5-billion-year history (due to volcanic activity, solar output, and shifts in the Earth's orbit), the current warming trend is different. It is happening at a rate unprecedented in thousands of years and is directly tied to human activity since the Industrial Revolution in the mid-1800s.

The primary cause is the greenhouse effect. When humans burn fossil fuels (like coal, oil, and gas) for energy, clear forests, and engage in intensive agriculture, we release massive amounts of greenhouse gases—mainly carbon dioxide ($CO_2$) and methane. These gases act like a blanket around the Earth, trapping heat in the atmosphere that would otherwise escape into space.

2. The Key Evidence

Scientists track a massive amount of data from satellites, ocean buoys, ice cores, weather stations, and tree rings. The evidence for a warming planet is undeniable:

•Rising Global Temperatures: Earth's average surface temperature has risen significantly since the late 19th century. The last decade has been the warmest on record, and global temperatures continue to hit record highs.

•Warming Oceans: The oceans have absorbed over 90% of the excess heat trapped by greenhouse gases, resulting in rising water temperatures that threaten marine life and fuel stronger storms.

•Shrinking Ice Sheets and Glaciers: Greenland and Antarctic ice sheets are losing billions of tons of ice mass every year. Glaciers in mountain ranges worldwide—from the Alps to the Rockies and Himalayas—are retreating rapidly.

•Rising Sea Levels: Global sea levels are rising at an accelerating rate. This is caused by two main factors: the melting of land-based ice (like glaciers and ice sheets) and the "thermal expansion" of water (water expands as it gets warmer).

•Extreme Weather: Around the globe, we are witnessing an increase in the frequency and intensity of extreme weather events, including more severe heatwaves, prolonged droughts, destructive wildfires, and heavier, more intense rainfall and flooding.

•Ocean Acidification: The ocean absorbs about 30% of the carbon dioxide emitted into the atmosphere. This has caused a 30% increase in the acidity of the ocean's surface waters, making it difficult for shellfish and coral reefs to survive and build their shells.

3. Why This Time Is Different

Skeptics sometimes point out that "the climate has always changed." While it is true that Earth has gone through ice ages and warm periods in the past, those natural shifts took place over thousands or millions of years, allowing ecosystems time to adapt.

The current warming is happening over decades, which is too fast for many plants and animals to adapt, leading to disruptions in food supplies, water availability, and human habitats. Furthermore, atmospheric levels of carbon dioxide are higher today than they have been at any point in human history.

Citations (5)

1climateforesight.euNot yet classified
climateforesight.eu
Backs: “There is an overwhelming consensus among the global scientific community that the Earth’s climate is warming rapidly and that human activities are the primary driver of this change. Major scientific organizations worldwide—including NASA, the Intergovernmental Panel on Climate Change (IPCC), and the national academies…”
2nasa.govGovernment
nasa.gov
Backs: “There is an overwhelming consensus among the global scientific community that the Earth’s climate is warming rapidly and that human activities are the primary driver of this change. Major scientific organizations worldwide—including NASA, the Intergovernmental Panel on Climate Change (IPCC), and the national academies…”
3theclimateconsensus.orgNot yet classified
theclimateconsensus.org
Backs: “Major scientific organizations worldwide—including NASA, the Intergovernmental Panel on Climate Change (IPCC), and the national academies of science of dozens of countries—agree on this reality. Peer-reviewed studies show that 97% to over 99% of actively publishing climate scientists agree that human-caused climate…”
4wikipedia.orgEncyclopedias and referencequality 0.83
wikipedia.org
Backs: “Peer-reviewed studies show that 97% to over 99% of actively publishing climate scientists agree that human-caused climate change is occurring. Here is a breakdown of how we know climate change is real, what is causing it, and the evidence supporting it.”
5nasa.govGovernment
nasa.gov
Backs: “While the Earth's climate has changed naturally over its 4.5-billion-year history (due to volcanic activity, solar output, and shifts in the Earth's orbit), the current warming trend is different. It is happening at a rate unprecedented in thousands of years and is directly tied to human activity since the Industrial…”