Climate change includes both global warming driven by human-induced emissions of greenhouse gases and the resulting large-scale shifts in weather patterns. Though there have been previous periods of climatic change, since the midth century humans have had an unprecedented impact on Earth's climate system and caused change on a global scale.. The largest driver of warming Estimated Reading Time: 8 mins Global warming refers to an unequivocal and continuing rise in the average temperature of earth ’s climate system (Wikipedia 1). it was discovered a long time ago around the year Global warming is primarily caused by a problem of too much carbon dioxide (causes of global warming Global warming is the temperature of Earth 's surface, oceans and atmosphere going up over tens to thousands of years. Average temperatures today are about 1 °C ( °F) higher than before people started burning a lot of coal around But in some parts of the world it is less than this and some blogger.comted Reading Time: 9 mins
Effects of climate change - Wikipedia
Climate change includes both global warming driven by human-induced emissions of greenhouse gases and the resulting large-scale shifts in weather patterns.
Though there have been previous periods of climatic changesince the midth century humans have had an unprecedented impact on Earth's climate system and caused change on a global scale. Temperature rise on land is about twice the global average increase, leading to desert expansion and more common heat waves essay on global warming wikipedia wildfires.
These impacts have led the World Health Organization to call climate change the greatest threat to global health in the 21st century. Many of these impacts are already felt at the current level of warming, which is about 1.
Adaptation consists of adjusting to actual or expected climate, [16] such as through improved coastline protectionbetter disaster managementassisted colonisationand the development of more resistant crops.
Adaptation alone cannot avert the risk of "severe, widespread and irreversible" impacts. Under the Paris Agreementnations collectively agreed to keep warming "well under 2. However, with pledges made under the Agreement, global warming would still reach about 2. Before the s, when it was unclear whether warming by greenhouse gases would dominate aerosol-induced cooling, scientists often used the term inadvertent climate modification to refer to humankind's impact on the climate.
In the s, the terms global warming and climate change were popularised, essay on global warming wikipedia former referring only to increased surface warming, while the latter describes the full effect of greenhouse gases on the climate. Various scientists, politicians and media figures have adopted the terms climate crisis or climate emergency to talk about climate change, while using global heating instead of global warming.
Multiple independently produced instrumental datasets show that the climate system is warming, [30] with the — decade being 0. There was little net warming between the 18th century and the midth century. Climate proxiessources of climate information from natural archives such as trees and ice coresshow that natural variations offset the early effects of the Industrial Revolution.
Evidence of warming from air temperature measurements are reinforced with a wide range of other observations. While locations of warming vary, the patterns essay on global warming wikipedia independent of where greenhouse gases are emitted, because the gases persist long enough to diffuse across the planet. Since the pre-industrial period, essay on global warming wikipedia, global average land temperatures have increased almost twice as fast as global average surface temperatures.
The Northern Hemisphere and the North Pole have warmed much faster than the South Pole and Southern Hemisphere. The Northern Hemisphere not only has much more land, but also more seasonal snow cover and sea icebecause of how the land masses are arranged around the Arctic Ocean.
As these surfaces flip from reflecting a lot of light to being dark after the ice has melted, they start absorbing more heat. The climate system experiences various cycles on its own which can essay on global warming wikipedia for years such as the El Niño—Southern Oscillationdecades or even centuries. increased concentrations of greenhouse gasessolar luminosityvolcanic eruptions, and variations in the Earth's orbit around the Sun.
To determine the human contribution to climate change, known internal climate variability and natural external forcings need to be ruled out. A key approach is to determine unique "fingerprints" for all potential causes, then compare these fingerprints with observed patterns of climate change. The Earth absorbs sunlightthen radiates it as heat. Greenhouse gases in the atmosphere absorb and reemit infrared radiation, slowing the rate at which it can pass through the atmosphere and escape into space.
Human activity since the Industrial Revolution, mainly extracting and burning fossil fuels coaloiland natural gas[62] has increased the amount of greenhouse gases in the atmosphere, essay on global warming wikipedia, resulting in a radiative imbalance.
Global anthropogenic greenhouse gas emissions inexcluding those from land use change, were equivalent to 52 billion tonnes of CO 2. Despite the contribution of deforestation to greenhouse gas emissions, the Earth's land surface, particularly its forests, remain a significant carbon sink for CO 2.
Natural processes, such as carbon fixation in the soil and photosynthesis, more than offset the greenhouse gas contributions from deforestation. First, essay on global warming wikipedia, CO 2 dissolves in the surface water. Afterwards, the ocean's overturning circulation distributes it deep into the ocean's interior, where it accumulates over time as part of the carbon cycle.
Air pollutionin the form of aerosolsessay on global warming wikipedia, not only puts a large burden on human health, but also affects the climate on a large scale. In addition to their direct effects scattering and absorbing solar radiationaerosols have indirect effects on the Earth's radiation budget.
Sulfate aerosols act as cloud condensation nuclei and thus lead to clouds that have more and smaller cloud droplets. These clouds reflect solar radiation more efficiently than clouds with fewer and larger droplets. While aerosols typically limit global warming by reflecting sunlight, black carbon in soot that falls on snow or ice can contribute to global warming. Not only does this increase the absorption of sunlight, it also increases melting and sea-level rise.
Humans change the Earth's surface mainly to create more agricultural land. In addition to affecting greenhouse gas concentrations, land-use changes affect global warming through a variety of other chemical and physical mechanisms. Changing the type of vegetation in a region affects the local temperature, by changing how much of the sunlight gets reflected back into space albedoand how much heat is lost by evaporation.
For instance, essay on global warming wikipedia, the change from a dark forest to grassland makes the surface lighter, causing it to reflect more sunlight. Deforestation can also contribute to changing temperatures by affecting the release essay on global warming wikipedia aerosols and other chemical compounds that influence clouds, and by changing wind patterns.
Physical climate models are unable to reproduce the rapid warming observed in recent decades when taking into account only variations in solar output and volcanic activity. Explosive volcanic eruptions represent the largest natural forcing over the essay on global warming wikipedia era.
When the eruption is sufficiently strong with sulfur dioxide reaching the stratosphere sunlight can be partially blocked for a couple of years, with a temperature signal lasting about twice as long. In the industrial era, volcanic activity has had negligible impacts on global temperature trends.
The response of the climate system to an initial forcing is modified by feedbacks: increased by self-reinforcing feedbacks and reduced by balancing feedbacks. As air gets warmer, it can hold more moisture.
After initial warming due to emissions of greenhouse gases, the atmosphere will hold more water. As water vapour is a potent greenhouse gas, this further heats the atmosphere. If clouds become more high and thin, they act as an insulator, reflecting essay on global warming wikipedia from below back downwards and warming the planet, essay on global warming wikipedia.
Around half of human-caused CO 2 emissions have been absorbed by land plants and by the oceans, essay on global warming wikipedia. Climate change increases droughts and heat waves that inhibit plant growth, which makes it uncertain whether this carbon sink will continue to grow in the future. Future warming depends on the strengths of climate feedbacks and on emissions of greenhouse gases. The physical realism of models is tested by examining their ability to simulate contemporary or past climates.
Various Representative Concentration Pathways RCPs can be used as input for climate models: "a stringent mitigation scenario RCP2. A subset of climate models add societal factors to a simple physical climate model.
These models simulate how population, economic growthand energy use affect — and interact with — the physical climate. With this information, these models can produce scenarios of how greenhouse gas emissions may vary in the future. This output is then used as input for physical climate models to generate climate change projections. The remaining carbon emissions budget is determined by modelling the carbon cycle and the climate sensitivity to greenhouse gases.
This amount corresponds to 10 to 13 years of current emissions. There are high uncertainties about the budget; for instance, it may be gigatonnes of CO 2 smaller due to methane release from permafrost and wetlands. The environmental effects of climate change are broad and far-reaching, affecting oceans, ice, and weather. Changes may occur gradually or rapidly. Evidence for these effects comes from studying climate change in the past, essay on global warming wikipedia, from modelling, essay on global warming wikipedia, and from modern observations.
Global sea level is rising as a consequence of glacial meltmelt of the ice sheets in Greenland and Antarcticaand thermal expansion. Between andthe rise increased over time, averaging 3. Climate change has led to decades of shrinking and thinning of the Arctic sea iceessay on global warming wikipedia, making it vulnerable to atmospheric anomalies.
An increase in dissolved CO 2 is causing oceans to acidify, essay on global warming wikipedia. The long-term effects of climate change include further ice melt, ocean warming, sea level rise, and ocean acidification. On the timescale of centuries to millennia, the magnitude of climate change will be determined primarily by anthropogenic CO 2 emissions.
Recent warming has driven many terrestrial and essay on global warming wikipedia species poleward and towards higher altitudes, essay on global warming wikipedia. The future balance of these opposing effects is unclear. The oceans have heated more slowly than the land, but plants and animals in the ocean have migrated towards the colder poles faster than species on land.
Ecological collapse. Bleaching has damaged the Great Barrier Reef and threatens reefs worldwide, essay on global warming wikipedia. Extreme weather. Drought and high temperatures worsened the bushfires in Australia. Arctic warming. Permafrost thaws undermine infrastructure and release methanea greenhouse gas. Habitat destruction.
Many arctic animals rely on sea ice, which has been disappearing in a warming Arctic. Pest propagation. Mild winters allow more pine beetles to survive to kill large swaths of forest. The effects of climate change on humansmostly due to warming and shifts in precipitationhave been detected worldwide.
Regional impacts of climate change are now observable on all continents and across ocean regions, [] with low-latitude, less developed areas facing the greatest risk. Health impacts include both the direct effects of extreme weather, leading to injury and loss of life, [] as well as indirect effects, such as undernutrition brought on by crop failures. Climate change is affecting food security and has caused reduction in global mean yields of maize, wheat, and soybeans between and Only polar stocks are showing an increased potential.
Economic damages due to climate change have been underestimated, and may essay on global warming wikipedia severe, with the probability of disastrous tail-risk events being nontrivial. Low-lying islands and coastal communities are threatened through hazards posed by sea level rise, such as flooding and permanent submergence.
Climate change may also increase vulnerabilities, leading to "trapped populations" in some areas who are not able to move due to a lack of resources. Environmental migration. Sparser rainfall leads to desertification that harms agriculture and can displace populations.
Shown: Telly, Mali. Agricultural changes.
Regional effects of global warming - Wikipedia audio article
, time: 40:14Short essay global warming wikipedia
Climate change includes both global warming driven by human-induced emissions of greenhouse gases and the resulting large-scale shifts in weather patterns. Though there have been previous periods of climatic change, since the midth century humans have had an unprecedented impact on Earth's climate system and caused change on a global scale.. The largest driver of warming Estimated Reading Time: 8 mins Global warming refers to an unequivocal and continuing rise in the average temperature of earth ’s climate system (Wikipedia 1). it was discovered a long time ago around the year Global warming is primarily caused by a problem of too much carbon dioxide (causes of global warming The global warming controversy concerns the public debate over whether global warming is occurring, how much has occurred in modern times, what has caused it, what its effects will be, whether any action can or should be taken to curb it, and if so what that action should be. In the scientific literature, there is a strong consensus that global surface temperatures have Estimated Reading Time: 11 mins
No comments:
Post a Comment