Is climate change real?

Yes, climate change is real.

There is an overwhelming, near-unanimous consensus among the global scientific community—including NASA, the National Oceanic and Atmospheric Administration (NOAA), the Intergovernmental Panel on Climate Change (IPCC), and the world’s leading scientific academies—that Earth’s climate is warming rapidly and that this warming is primarily driven by human activities.

Over the decades, scientists have gathered vast amounts of evidence from multiple lines of research to confirm this.

1. The Evidence: How We Know It’s Happening

Rather than relying on isolated local weather events, scientists look at long-term global indicators to track climate change:

•Rising Global Temperatures: Earth’s average surface temperature has risen by about 1.1°C (2°F) since the late 19th century. The ten warmest years on record have all occurred in the last decade, with 2023 marking the warmest year on record since systematic tracking began in 1880.

•Melting Ice and Glaciers: Ice sheets in Greenland and Antarctica, along with mountain glaciers worldwide, are losing mass rapidly. Satellite data shows that the amount of Arctic sea ice has drastically declined over recent decades.

•Rising Sea Levels: Because of melting glaciers and ice sheets, combined with the fact that water expands as it warms, global sea levels have risen roughly 8 inches (20 cm) in the last century, and the rate of rise is accelerating.

•Ocean Warming and Acidification: The world's oceans have absorbed over 90% of the excess heat trapped in the atmosphere. Additionally, oceans absorb about 30% of human-emitted carbon dioxide (CO₂), which triggers a chemical reaction that makes the water more acidic, threatening marine ecosystems like coral reefs.

•More Extreme Weather: We are observing a significant increase in the frequency and intensity of extreme weather events, including more severe heatwaves, prolonged droughts, heavier rainfall causing flash floods, and stronger hurricanes.

2. The Cause: The Greenhouse Effect and Human Activity

The fundamental physics of climate change have been understood since the 19th century. It is driven by the greenhouse effect:

1.Sun radiates energy down to the Earth.

2.The Earth absorbs some of this energy and radiates the rest back out toward space.

3.Greenhouse gases in our atmosphere (such as carbon dioxide, methane, and nitrous oxide) act like an insulating blanket, trapping some of that heat in the atmosphere and keeping the planet warm enough to sustain life.

However, since the Industrial Revolution in the mid-1800s, human activities have heavily supercharged this natural effect. By burning fossil fuels (coal, oil, and natural gas), clearing forests, and expanding intensive agriculture, we have released massive, unprecedented amounts of greenhouse gases into the atmosphere.

Carbon dioxide levels in the atmosphere have risen from pre-industrial levels of about 280 parts per million (ppm) to over 420 ppm today—a level higher than at any point in human history.

3. Hasn't the Climate Changed Before?

Yes, Earth’s climate has gone through natural cycles of warming and cooling (including ice ages) over millions of years. These historical shifts were primarily caused by slow, natural changes in the Earth’s orbit, solar activity, or volcanic eruptions.

What makes the current warming cycle different is the rate of change:

•Natural warming cycles in the past typically took thousands of years to occur.

•The warming we are experiencing today is happening at a rate unprecedented in the last 10,000 years.

•Natural factors (like changes in solar output or volcanic emissions) cannot explain the rapid temperature rise we have seen over the last century. In fact, in 2021, NASA scientists published a breakthrough study using direct satellite observations to measure the exact amount of heat trapped in the Earth's system, mathematically proving that human-produced emissions are the direct driver of the modern energy imbalance warming our planet.

Citations (5)

1nasa.govGovernment
nasa.gov
Backs: “There is an overwhelming, near-unanimous consensus among the global scientific community—including NASA, the National Oceanic and Atmospheric Administration (NOAA), the Intergovernmental Panel on Climate Change (IPCC), and the world’s leading scientific academies—that Earth’s climate is warming rapidly and that this…”
2nasa.govGovernment
nasa.gov
Backs: “There is an overwhelming, near-unanimous consensus among the global scientific community—including NASA, the National Oceanic and Atmospheric Administration (NOAA), the Intergovernmental Panel on Climate Change (IPCC), and the world’s leading scientific academies—that Earth’s climate is warming rapidly and that this…”
3cbsnews.comNews and mediaquality 0.88
cbsnews.com
Backs: “Melting Ice and Glaciers: Ice sheets in Greenland and Antarctica, along with mountain glaciers worldwide, are losing mass rapidly. Satellite data shows that the amount of Arctic sea ice has drastically declined over recent decades.”
4qz.comNews and mediaquality 0.86
qz.com
Backs: “Ocean Warming and Acidification: The world's oceans have absorbed over 90% of the excess heat trapped in the atmosphere. Additionally, oceans absorb about 30% of human-emitted carbon dioxide (CO₂), which triggers a chemical reaction that makes the water more acidic, threatening marine ecosystems like coral reefs.”
5reddit.comForums and Q&A
reddit.com
Backs: “However, since the Industrial Revolution in the mid-1800s, human activities have heavily supercharged this natural effect. By burning fossil fuels (coal, oil, and natural gas), clearing forests, and expanding intensive agriculture, we have released massive, unprecedented amounts of greenhouse gases into the atmosphere.”