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Since the mid-1700s Industrial Revolution, humans have burned coal, then oil and natural gas on an unprecedented scale to power factories, ships, trains, cars and power plants. Burning these fossil fuels releases large amounts of greenhouse gases—especially carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). Other activities such as deforestation, cement production and certain industrial processes add CO2 and other greenhouse gases; agriculture and livestock produce methane and nitrous oxide; and some manufactured chemicals are powerful warming gases.

Greenhouse gases act like a blanket around Earth: sunlight warms the surface, which emits infrared radiation; greenhouse gases absorb some of that outgoing infrared and re-radiate it, including back toward the surface, raising average temperatures. This natural greenhouse effect is essential for life, but adding more gases makes the blanket thicker and produces extra warming.

Direct atmospheric monitoring (for example, the Mauna Loa record) and air trapped in ice cores show large increases in greenhouse-gas concentrations since pre-industrial times—CO2 rose from roughly 280 parts per million to well over 400 ppm. Global temperature records show a concurrent upward trend.

Multiple lines of evidence—observations, paleoclimate data and climate models—support human causation. Models that include only natural factors like volcanic eruptions and solar changes cannot reproduce the rapid warming of the 20th and 21st centuries; models that include human greenhouse-gas emissions do. Additional fingerprints, such as warming of the lower atmosphere combined with cooling of the upper atmosphere, match the expected response to increased greenhouse gases.

Although Earth’s climate has changed naturally over geological time, the speed and magnitude of recent warming and its coincidence with rising emissions lead the vast majority of climate scientists to conclude human activities are the dominant cause. Impacts include more heat waves, changed precipitation patterns, sea level rise, and ocean warming and acidification, threatening ecosystems and human societies.
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Since the mid-1700s, when the Industrial Revolution started, people have burned lots of coal, oil, and natural gas to run factories, ships, trains, cars, and power plants. Burning these fossil fuels releases greenhouse gases like carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). Other things people do—cutting down forests, making cement, some industrial processes, and farming animals—also add these gases.

Greenhouse gases act like a blanket around Earth. Sunlight warms the surface, which then gives off heat (infrared). The gases trap some of that heat and send it back toward the ground, making Earth warmer. That natural greenhouse effect is good because it keeps the planet livable, but adding more gases makes the blanket thicker and causes extra warming.

Scientists measure these gases directly, for example at Mauna Loa, and they study air trapped in ice cores. Both show big increases since pre-industrial times: CO2 went from about 280 parts per million to over 400 ppm. Global temperature records also show the planet has warmed a lot during the 20th and 21st centuries.

Many lines of evidence point to humans as the main cause. Climate models that include only natural things like volcanoes and changes in the sun can’t explain the fast warming. Models that include human greenhouse-gas emissions do match what we see. Other clues, like warming near the surface and cooling higher up, fit the greenhouse-gas explanation. The effects we’re already seeing include more heat waves, changing rainfall patterns, rising seas, and warmer, more acidic oceans, which are dangerous for ecosystems and people.