Is climate change real?

Yes, climate change is real.

There is an overwhelming, unequivocal consensus within the global scientific community that the Earth’s climate is warming at an unprecedented rate and that human activities are the primary driver.

Multiple independent studies have shown that between 97% and over 99% of actively publishing climate scientists agree that human-caused climate change is happening. This consensus is supported by major scientific organizations worldwide, including NASA, the National Oceanic and Atmospheric Administration (NOAA), the Intergovernmental Panel on Climate Change (IPCC), and the national science academies of every major industrialized nation.

The Evidence: How Do We Know?

Scientists monitor the Earth's climate using satellites, weather stations, ocean buoys, and historical records like ice cores, tree rings, and coral reefs. The evidence of rapid climate change is compelling and measurable:

•Rising Global Temperatures: The planet’s average surface temperature has risen by about 2 degrees Fahrenheit (over 1 degree Celsius) since the late 19th century, with most of the warming occurring in the last few decades.

•Surging Greenhouse Gases: Atmospheric carbon dioxide ($CO_2$) levels are higher than they have been in at least 800,000 years. Since the Industrial Revolution, humans have rapidly burned fossil fuels (coal, oil, and natural gas), releasing greenhouse gases that trap heat in the atmosphere. This $CO_2$ increase is happening about 250 times faster than it did from natural sources after the last Ice Age.

•Melting Ice and Shrinking Glaciers: Ice sheets in Greenland and Antarctica are losing hundreds of billions of tons of mass per year. Glaciers are retreating almost everywhere globally, and Arctic sea ice is rapidly declining in both area and thickness.

•Rising Sea Levels: Global sea levels rose about 8 inches (20 cm) in the last century, and the rate of rise has nearly doubled in recent decades. This is caused by water from melting glaciers and ice sheets, as well as the thermal expansion of seawater as it warms.

•Extreme Weather Events: The frequency and intensity of extreme weather events—such as severe droughts, devastating wildfires, torrential rainstorms, and intense hurricanes—have visibly increased worldwide.

•Ocean Acidification and Warming: The world's oceans have absorbed more than 90% of the extra heat trapped by greenhouse gases. They have also absorbed about 30% of human-emitted carbon dioxide, causing the oceans to become roughly 30% more acidic, which threatens coral reefs and marine life.

Hasn't the Climate Changed Before?

Yes, Earth's climate has gone through natural cycles of ice ages and warmer periods over millions of years. However, those historical changes were driven by very slow, natural factors like gradual shifts in the Earth’s orbit or volcanic activity.

The current warming trend is fundamentally different for two reasons:

1.The Speed: Modern warming is occurring roughly 10 times faster than the average rate of warming observed after past ice ages.

2.The Cause: Natural factors (like solar output or volcanic eruptions) cannot explain the rapid warming we see today. When scientists model the climate using only natural cycles, the Earth does not show this dramatic temperature spike. The warming can only be explained when greenhouse gases produced by human activities are factored in.

Citations (6)

1nasa.govGovernment
nasa.gov
Backs: “There is an overwhelming, unequivocal consensus within the global scientific community that the Earth’s climate is warming at an unprecedented rate and that human activities are the primary driver.”
2wikipedia.orgEncyclopedias and referencequality 0.83
wikipedia.org
Backs: “There is an overwhelming, unequivocal consensus within the global scientific community that the Earth’s climate is warming at an unprecedented rate and that human activities are the primary driver.”
3aaas.orgNonprofits and think tanks
aaas.org
Backs: “Multiple independent studies have shown that between 97% and over 99% of actively publishing climate scientists agree that human-caused climate change is happening. This consensus is supported by major scientific organizations worldwide, including NASA, the National Oceanic and Atmospheric Administration (NOAA), the…”
4cornell.eduAcademic
cornell.edu
Backs: “Multiple independent studies have shown that between 97% and over 99% of actively publishing climate scientists agree that human-caused climate change is happening. This consensus is supported by major scientific organizations worldwide, including NASA, the National Oceanic and Atmospheric Administration (NOAA), the…”
5edf.orgNonprofits and think tanks
edf.org
Backs: “This consensus is supported by major scientific organizations worldwide, including NASA, the National Oceanic and Atmospheric Administration (NOAA), the Intergovernmental Panel on Climate Change (IPCC), and the national science academies of every major industrialized nation.”
6royalsociety.orgAcademic
royalsociety.org
Backs: “Since the Industrial Revolution, humans have rapidly burned fossil fuels (coal, oil, and natural gas), releasing greenhouse gases that trap heat in the atmosphere. This $CO_2$ increase is happening about 250 times faster than it did from natural sources after the last Ice Age.”