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2019年11月22日 · Human causes of climate change include industrial activity, agricultural practices and deforestation. The earth's own feedback loop, which increases the amount of water vapor in the atmosphere and warms the oceans, accelerates the warming and contributes to climate change, a related phenomenon.
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6 天前 · This article provides an overview of the scientific background related to the subject of global warming. It considers the causes of rising near-surface air temperatures, the influencing factors, the process of climate research and forecasting, and the possible ecological and social impacts of rising temperatures.
- Overview
- IPCC conclusions
- Gaseous abilities
- Climate change continues
Human activity is driving climate change, including global temperature rise.
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The average temperature of the Earth is rising at nearly twice the rate it was 50 years ago. This rapid warming trend cannot be explained by natural cycles alone, scientists have concluded. The only way to explain the pattern is to include the effect of greenhouse gases (GHGs) emitted by humans.
Current levels of the greenhouse gases carbon dioxide, methane, and nitrous oxide in our atmosphere are higher than at any point over the past 800,000 years, and their ability to trap heat is changing our climate in multiple ways.
To come to a scientific conclusion on climate change and what to do about it, the United Nations in 1988 formed a group called the Intergovernmental Panel on Climate Change, or IPCC. The IPCC meets every few years to review the latest scientific findings and write a report summarizing all that is known about global warming. Each report represents a consensus, or agreement, among hundreds of leading scientists.
One of the first things the IPCC concluded is that there are several greenhouse gases responsible for warming, and humans emit them in a variety of ways. Most come from the combustion of fossil fuels in cars, buildings, factories, and power plants. The gas responsible for the most warming is carbon dioxide, or CO2. Other contributors include methane released from landfills, natural gas and petroleum industries, and agriculture (especially from the digestive systems of grazing animals); nitrous oxide from fertilizers; gases used for refrigeration and industrial processes; and the loss of forests that would otherwise store CO2.
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An iceberg melts in the waters off Antarctica. Climate change has accelerated the rate of ice loss across the continent.
An iceberg melts in the waters off Antarctica. Climate change has accelerated the rate of ice loss across the continent.
Different greenhouse gases have very different heat-trapping abilities. Some of them can trap more heat than an equivalent amount of CO2. A molecule of methane doesn't hang around the atmosphere as long as a molecule of carbon dioxide will, but it is at least 84 times more potent over two decades. Nitrous oxide is 264 times more powerful than CO2.
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Climate Change 101 with Bill Nye
Climate Change is a real and serious issue. In this video Bill Nye, the Science Guy, explains what causes climate change, how it affects our planet, why we need to act promptly to mitigate its effects, and how each of us can contribute to a solution.
Other gases, such as chlorofluorocarbons, or CFCs—which have been banned in much of the world because they also degrade the ozone layer—have heat-trapping potential thousands of times greater than CO2. But because their emissions are much lower than CO2, none of these gases trap as much heat in the atmosphere as CO2 does.
When those gases that humans are adding to Earth's atmosphere trap heat, it’s called the "greenhouse effect." The gases let light through but then keep much of the heat that radiates from the surface from escaping back into space, like the glass walls of a greenhouse. The more greenhouse gases in the atmosphere, the more dramatic the effect, and the more warming that happens.
Despite global efforts to address climate change, including the landmark 2015 Paris climate agreement, carbon dioxide emissions from fossil fuels continue to rise, hitting record levels in 2018.
Many people think of global warming and climate change as synonyms, but scientists prefer to use “climate change” when describing the complex shifts now affecting our planet’s weather and climate systems. Climate change encompasses not only rising average temperatures but also extreme weather events, shifting wildlife populations and and habitats, rising seas, and a range of other impacts.
The Causes of Climate Change. Human activities are driving the global warming trend observed since the mid-20th century. En español. Takeaways. The greenhouse effect is essential to life on Earth, but human-made emissions in the atmosphere are trapping and slowing heat loss to space.
2024年10月2日 · Fossil fuels – coal, oil and gas – are by far the largest contributor to global climate change, accounting for over 75 per cent of global greenhouse gas emissions and nearly 90 per cent of all...
2021年4月7日 · What is global warming? Global warming causes, effects, extreme weather, facts, and relation to climate change. Everything you wanted to know about our changing climate but were too afraid to...
6 天前 · How does global warming work? Where does global warming occur in the atmosphere? Why is global warming a social problem? Where does global warming affect polar bears?
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