Why is global warming happening

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Global Warming Science

why is global warming happening

What’s REALLY Warming the Earth?

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Scientists know that certain gases trap heat and act like a blanket to warm the planet. One of the most important is carbon dioxide CO 2 , which we release into the atmosphere when we burn fossil fuels — oil, coal, and natural gas — to generate electricity, power our vehicles, and heat our homes. As we overload our atmosphere with carbon dioxide, more and more heat is trapped — and Earth steadily warms up in response. How do we know? The scientific evidence is overwhelming.

This graph, based on the comparison of atmospheric samples contained in ice cores and more recent direct measurements, provides evidence that atmospheric CO 2 has increased since the Industrial Revolution. Credit: Luthi, D. Petit et al. Find out more about ice cores external site. The Earth's climate has changed throughout history. Just in the last , years there have been seven cycles of glacial advance and retreat, with the abrupt end of the last ice age about 7, years ago marking the beginning of the modern climate era — and of human civilization.

Jump to navigation. And yes, it's really happening. Over the past 50 years, the average global temperature has increased at the fastest rate in recorded history. And scientists say that unless we curb global-warming emissions, average U. Normally, this radiation would escape into space—but these pollutants, which can last for years to centuries in the atmosphere, trap the heat and cause the planet to get hotter.

Climate Change: How Do We Know? Scientific evidence for warming of the climate system is unequivocal. Ice cores drawn from Greenland, Antarctica, and tropical mountain glaciers show that the Earth’s climate responds to changes in greenhouse gas levels.
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Scientists attribute the global warming trend observed since the mid th century to the human expansion of the "greenhouse effect" 1 — warming that results when the atmosphere traps heat radiating from Earth toward space. Certain gases in the atmosphere block heat from escaping. Long-lived gases that remain semi-permanently in the atmosphere and do not respond physically or chemically to changes in temperature are described as "forcing" climate change. Gases, such as water vapor, which respond physically or chemically to changes in temperature are seen as "feedbacks. On Earth, human activities are changing the natural greenhouse. Over the last century the burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide CO 2. This happens because the coal or oil burning process combines carbon with oxygen in the air to make CO 2.



Global Warming 101

Contact: Kassie Siegel. The basic physics of global warming are as well understood as any scientific phenomenon.

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Vital Signs of the Planet: Global Climate Change and Global Warming. This happens because the coal or oil burning process combines carbon with oxygen in.
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