Is climate change real?

Yes, climate change is real.

There is an overwhelming scientific consensus that the Earth's climate is warming rapidly and that this shift is primarily driven by human activities. Multiple studies have shown that between 97% and 99% of actively publishing climate scientists agree on this. Major scientific organizations worldwide—including NASA, the National Oceanic and Atmospheric Administration (NOAA), the Intergovernmental Panel on Climate Change (IPCC), and the National Academies of Science in dozens of countries—have issued public statements confirming this reality.

The evidence for climate change is drawn from several key observations:

1. Rapidly Rising Global Temperatures

Earth's average surface temperature has risen significantly since the late 19th century, with the vast majority of the warming occurring in the past few decades. According to temperature data from NASA and NOAA, the last decade has been the warmest since modern record-keeping began in 1880.

2. Increases in Greenhouse Gases

By analyzing ancient air bubbles trapped in ice sheets, scientists can measure past atmospheric conditions. Carbon dioxide ($CO_2$) levels are now higher than at any point in at least the last 800,000 years. This spike began during the Industrial Revolution, corresponding directly with humanity's massive increase in burning fossil fuels (like coal, oil, and gas). Greenhouse gases trap heat in the atmosphere, creating a "greenhouse effect" that warms the planet.

3. Shrinking Ice Sheets and Glaciers

The Earth’s cryosphere (frozen water) is shrinking:

4. Rising Sea Levels

Global sea levels have risen significantly over the past century, and the rate of rise is accelerating. This is caused by two main factors: the melting of land-based glaciers and ice sheets, and the thermal expansion of seawater as it warms.

5. Warming and Acidifying Oceans

The oceans have absorbed more than 90% of the excess heat trapped by greenhouse gases, leading to rapidly warming water temperatures. Additionally, the oceans absorb about 30% of the $CO_2$ emitted into the atmosphere. This has triggered a chemical reaction known as ocean acidification, which threatens marine life, particularly organisms with calcium carbonate shells (like corals and shellfish).

6. More Extreme Weather Events

An increase in average global temperature shifts weather patterns. Around the world, we are seeing an increase in the frequency, duration, and intensity of extreme weather events, including:

What is the primary cause?

While Earth’s climate has changed naturally over millions of years due to solar cycles, volcanic eruptions, and orbital shifts, these natural factors currently have a negligible effect compared to human influence. The IPCC states unequivocally that human influence is the principal driver of modern global warming.

The primary culprits are: