[Update] climate change | Definition, Causes, Effects, & Facts | climate change – Pickpeup

climate change: คุณกำลังดูกระทู้

This article addresses the concept of climatic variation and change within the set of integrated natural features and processes known as the Earth system. The nature of the evidence for climate change is explained, as are the principal mechanisms that have caused climate change throughout the history of Earth. Finally, a detailed description is given of climate change over many different timescales, ranging from a typical human life span to all of geologic time. For a detailed description of the development of Earth’s atmosphere, see the article atmosphere, evolution of . For full treatment of the most critical issue of climate change in the contemporary world, see global warming .

Climate is often defined loosely as the average weather at a particular place, incorporating such features as temperature , precipitation , humidity , and windiness . A more specific definition would state that climate is the mean state and variability of these features over some extended time period. Both definitions acknowledge that the weather is always changing, owing to instabilities in the atmosphere . And as weather varies from day to day, so too does climate vary, from daily day-and-night cycles up to periods of geologic time hundreds of millions of years long. In a very real sense, climate variation is a redundant expression—climate is always varying. No two years are exactly alike, nor are any two decades, any two centuries, or any two millennia.

Which gases play an important role in climate change? What percentage of scientists agree that humans contribute to this process? Test your knowledge of this “hot” topic with this quiz.

The atmosphere is a dynamic fluid that is continually in motion. Both its physical properties and its rate and direction of motion are influenced by a variety of factors, including solar radiation , the geographic position of continents , ocean currents , the location and orientation of mountain ranges, atmospheric chemistry , and vegetation growing on the land surface. All these factors change through time. Some factors, such as the distribution of heat within the oceans , atmospheric chemistry, and surface vegetation, change at very short timescales. Others, such as the position of continents and the location and height of mountain ranges, change over very long timescales. Therefore, climate, which results from the physical properties and motion of the atmosphere, varies at every conceivable timescale.

climate change , periodic modification of Earth ’s climate brought about as a result of changes in the atmosphere as well as interactions between the atmosphere and various other geologic, chemical, biological, and geographic factors within the Earth system.

The

Earth system

The atmosphere is influenced by and linked to other features of Earth, including oceans, ice masses (glaciers and sea ice), land surfaces, and vegetation. Together, they make up an integrated Earth system, in which all components interact with and influence one another in often complex ways. For instance, climate influences the distribution of vegetation on Earth’s surface (e.g., deserts exist in arid regions, forests in humid regions), but vegetation in turn influences climate by reflecting radiant energy back into the atmosphere, transferring water (and latent heat) from soil to the atmosphere, and influencing the horizontal movement of air across the land surface.

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Tourist boat in front of a massive iceberg near the coast of Greenland.

Paul Zizka/Visit Greenland (Visitgreenland.com)Karakum Desert, TurkmenistanKarakum Desert, Turkmenistan

Drought-resistant plants growing in the Repetek Preserve in the southeastern Karakum Desert, Turkmenistan.

© Rodger Jackman/Oxford Scientific Films Ltd.deciduous treesdeciduous trees

Deciduous forest in fall coloration, Wasatch Mountains, Utah.

Dorothea W. Woodruff/Encyclopædia Britannica, Inc.

Earth scientists and atmospheric scientists are still seeking a full understanding of the complex feedbacks and interactions among the various components of the Earth system. This effort is being facilitated by the development of an interdisciplinary science called Earth system science. Earth system science is composed of a wide range of disciplines, including climatology (the study of the atmosphere), geology (the study of Earth’s surface and underground processes), ecology (the study of how Earth’s organisms relate to one another and their environment), oceanography (the study of Earth’s oceans), glaciology (the study of Earth’s ice masses), and even the social sciences (the study of human behaviour in its social and cultural aspects).

A full understanding of the Earth system requires knowledge of how the system and its components have changed through time. The pursuit of this understanding has led to development of Earth system history, an interdisciplinary science that includes not only the contributions of Earth system scientists but also paleontologists (who study the life of past geologic periods), paleoclimatologists (who study past climates), paleoecologists (who study past environments and ecosystems), paleoceanographers (who study the history of the oceans), and other scientists concerned with Earth history. Because different components of the Earth system change at different rates and are relevant at different timescales, Earth system history is a diverse and complex science. Students of Earth system history are not just concerned with documenting what has happened; they also view the past as a series of experiments in which solar radiation, ocean currents, continental configurations, atmospheric chemistry, and other important features have varied. These experiments provide opportunities to learn the relative influences of and interactions between various components of the Earth system. Studies of Earth system history also specify the full array of states the system has experienced in the past and those the system is capable of experiencing in the future.

Undoubtedly, people have always been aware of climatic variation at the relatively short timescales of seasons, years, and decades. Biblical scripture and other early documents refer to droughts, floods, periods of severe cold, and other climatic events. Nevertheless, a full appreciation of the nature and magnitude of climatic change did not come about until the late 18th and early 19th centuries, a time when the widespread recognition of the deep antiquity of Earth occurred. Naturalists of this time, including Scottish geologist Charles Lyell, Swiss-born naturalist and geologist Louis Agassiz, English naturalist Charles Darwin, American botanist Asa Gray, and Welsh naturalist Alfred Russel Wallace, came to recognize geologic and biogeographic evidence that made sense only in the light of past climates radically different from those prevailing today.

Long-term data sets reveal increased concentrations of the greenhouse gas carbon dioxide in Earth's atmosphere

Long-term data sets reveal increased concentrations of the greenhouse gas carbon dioxide in Earth’s atmosphere

Learn about carbon dioxide and its relationship to warming conditions at Earth’s surface, as explained by John P. Rafferty, biological and Earth sciences editor of Encyclopædia Britannica.

Encyclopædia Britannica, Inc.See all videos for this article

Geologists and paleontologists in the 19th and early 20th centuries uncovered evidence of massive climatic changes taking place before the Pleistocene—that is, before some 2.6 million years ago. For example, red beds indicated aridity in regions that are now humid (e.g., England and New England), whereas fossils of coal-swamp plants and reef corals indicated that tropical climates once occurred at present-day high latitudes in both Europe and North America. Since the late 20th century the development of advanced technologies for dating rocks, together with geochemical techniques and other analytical tools, have revolutionized the understanding of early Earth system history.

The occurrence of multiple epochs in recent Earth history during which continental glaciers, developed at high latitudes, penetrated into northern Europe and eastern North America was recognized by scientists by the late 19th century. Scottish geologist James Croll proposed that recurring variations in orbital eccentricity (the deviation of Earth’s orbit from a perfectly circular path) were responsible for alternating glacial and interglacial periods. Croll’s controversial idea was taken up by Serbian mathematician and astronomer Milutin Milankovitch in the early 20th century. Milankovitch proposed that the mechanism that brought about periods of glaciation was driven by cyclic changes in eccentricity as well as two other orbital parameters: precession (a change in the directional focus of Earth’s axis of rotation) and axial tilt (a change in the inclination of Earth’s axis with respect to the plane of its orbit around the Sun). Orbital variation is now recognized as an important driver of climatic variation throughout Earth’s history (see below Orbital [Milankovitch] variations).

precessionprecession

The precession of Earth’s axis.

Encyclopædia Britannica, Inc.


How can Europe tackle climate change? – BBC News


Climate change needs to be tackled by a global effort, with the countries creating the biggest emissions required to make the biggest adaptations.
The EU and UK create more than 7% of CO2 emissions worldwide.
Almost 200 countries are being asked for their plans to cut emissions at the upcoming COP26 climate conference, and it could lead to major changes to our everyday lives.
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ClimateChange Europe BBCNews

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How can Europe tackle climate change? - BBC News

How Dem debate over Biden climate agenda could affect U.S. economy


The coming weeks will be pivotal for President Joe Biden’s domestic agenda as Congress and the White House debate the tradeoffs of a major bill that could affect the pocketbooks, working conditions and social safety net for Americans. William Brangham looks at what it could mean for coping with climate change with congressional correspondent Lisa Desjardins and ProPublica’s Abrahm Lustgarten.
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How Dem debate over Biden climate agenda could affect U.S. economy

Tổng Bí thư: Suy thoái về tư tưởng chính trị có mặt còn diễn biến tinh vi, phức tạp hơn | VTC Now


VTC Now | Sáng 10/4, phát biểu tại Hội nghị Trung ương 4, Tổng Bí thư Nguyễn Phú Trọng cho rằng tình trạng suy thoái về tư tưởng chính trị, đạo đức, lối sống… vẫn chưa được ngăn chặn, đẩy lùi, thậm chí có mặt còn diễn biến tinh vi, phức tạp hơn.
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Tổng Bí thư: Suy thoái về tư tưởng chính trị có mặt còn diễn biến tinh vi, phức tạp hơn | VTC Now

Climate Action Tracker: The state of the climate crisis in 2021 | TED


Take action on climate change at http://countdown.ted.com.
2021 is a critical year for climate change. According to the Paris Climate Agreement, governments must decide now on how to reduce the amount of carbon they pump into the atmosphere in order to avoid the most devastating consequences of global warming. So, are we on track to limit global warming to only 1.5 degrees Celsius? The Climate Action Tracker explains the good news and the bad news for the planet. (Updated June 2021)
This talk was part of the Countdown Global Launch on 10.10.2020. (Watch the full event here: https://youtu.be/5dVcn8NjbwY.) Countdown is TED’s global initiative to accelerate solutions to the climate crisis. The goal: to build a better future by cutting greenhouse gas emissions in half by 2030, in the race to a zerocarbon world. Get involved at https://countdown.ted.com/signup
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Climate Action Tracker: The state of the climate crisis in 2021 | TED

In the Alps, climate change is turning glaciers into lakes • FRANCE 24 English


As temperatures continue to rise, climate change is turning glaciers into lakes. In the Alps, glacial lake outbursts are no longer a distant threat but a reality.
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In the Alps, climate change is turning glaciers into lakes • FRANCE 24 English

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ขอบคุณมากสำหรับการดูหัวข้อโพสต์ climate change

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