These changes have led to the emergence of large-scale environmental hazards to human health, such as extreme weather, ozone depletion, increased danger of wildland fires, loss of biodiversity, stresses to food-producing systems and the global spread of infectious diseases.

Global warming has brought about possibly irreversible alterations to Earth's geological, biological and ecological systems.



By the middle of 2018 they had risen to 406 ppm, and, if fossil fuels continue to be burned at current rates, they are projected to reach 550 ppm by the mid-21st century—essentially, a doubling of carbon dioxide concentrations in 300 years.A vigorous debate is in progress over the extent and seriousness of rising surface temperatures, the effects of past and future warming on human life, and the need for action to reduce future warming and deal with its consequences.

Greenhouse gases such as carbon dioxide accumulate in the atmosphere and trap heat that normally would exit into outer space.

Infrared (IR) radiation is then emitted from the surface. 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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It is a major aspect of climate change which, in addition to rising global surface temperatures, also includes its effects, such as changes in precipitation. Global warming is the ongoing rise of the average temperature of the Earth's climate system and has been demonstrated by direct temperature measurements and by measurements of various effects of the warming. Causes of global warming, explained.






Deforestation is ongoing and is shaping climate and geography.. Deforestation is a contributor to global warming, and is often cited as one of the major causes of the enhanced greenhouse effect.Tropical deforestation is responsible for approximately 20% of world greenhouse gas emissions.


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.

Livestock farming accounts for over 60% of our global ammonia emissions.

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An overview of the role greenhouse gases play in modifying Earth's climate.During the second half of the 20th century and early part of the 21st century, global average surface temperature increased and sea level rose.



For a detailed description of Earth’s climate, its processes, and the responses of living things to its changing nature,

This article provides an overview of the scientific background and public policy debate related to the subject of global warming.

Global warming can reach levels of irreversibility, and increasing levels of global warming can eventually reach an extinction level where humanity and all life on earth will end.

Some of them can trap more heat than an equivalent amount of CO2. Assistant Professor of International Relations, Boston University.

It considers the causes of rising near-surface air temperatures, the influencing factors, the process of climate research and forecasting, the possible ecological and social impacts of rising temperatures, and the public policy developments since the mid-20th century.

By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica.Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Average temperatures today are about 1 °C (1.8 °F) higher than before the Industrial Revolution, which started around 1750, during the Little Ice Age, an abnormally cold period. What is Global Warming?







Some incoming sunlight is reflected by Earth's atmosphere and surface, but most is absorbed by the surface, which is warmed. It has been estimated that, at the beginning of the industrial age in the mid-18th century, carbon dioxide concentrations in the atmosphere were roughly 280 parts per million (ppm). Get exclusive access to content from our 1768 First Edition with your subscription.

The argument and the evidence were further strengthened by Claude Pouillet in 1827 and 1838. Learn the human impact and consequences of climate change for the environment, and our lives.Learn the human impact and consequences of climate change for the environment, and our lives.The average temperature of the Earth is rising at nearly twice the rate it was 50 years ago. Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere.




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