Is climate change real?

Yes, climate change is real. There is an overwhelming, virtually unanimous agreement among the global scientific community that the Earth’s climate is warming and that human activities are the primary driver.

Multiple independent lines of evidence—ranging from deep-ocean temperature measurements to satellite observations of the upper atmosphere—confirm that the planet is changing rapidly.

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

Scientists track a wide variety of indicators that show the Earth's climate system is warming:

2. What Is Causing It?

The primary driver of modern climate change is the greenhouse effect.

The Earth’s atmosphere naturally contains gases—such as carbon dioxide ($CO_2$), methane ($CH_4$), and water vapor—that trap heat from the Sun, keeping the planet warm enough to support life.

However, since the Industrial Revolution, human activities have dramatically increased the concentration of these gases in the atmosphere:

3. The Scientific Consensus

A common misconception is that scientists are still debating whether climate change is real or human-caused. In reality, over 99% of peer-reviewed scientific papers published by climate scientists agree that humans are causing climate change.

Virtually every major scientific organization in the world—including NASA, the National Oceanic and Atmospheric Administration (NOAA), the Intergovernmental Panel on Climate Change (IPCC), and the national academies of science of dozens of countries—endorses this conclusion.

Why It Matters

Climate change is not just about warmer temperatures; it alters the fundamental balance of the ecosystems that sustain human society. It affects global food supplies, water availability, human health, and national security. Understanding that climate change is real and human-caused is the foundation for global efforts to reduce emissions, transition to clean energy, and adapt to the changes that are already occurring.