• Source: 2 degree climate target

The two target="_blank">degree target is the international target="_blank">climate policy goal of limiting global warming to less than two degrees Celsius compared to pre-industrialization levels (1850–1900). It is an integral part of the Paris target="_blank">climate agreement. This objective is a political determination based on scientific knowledge concerning the probable consequences of global warming, which dates from the Copenhagen Conference in 2009. Physical target="_blank">climate risk scenarios, which often project to the end of the century, 2100, use the target="_blank">2 °C target as a reference point. The time at which global mean temperature is predicted to reach +target="_blank">2 °C compared to the pre-industrial period (1850–1900) is termed the "crossing year".
As a global target for limiting emissions, the target="_blank">2 °C target has frequently been criticized for being higher than desirable, because two degrees of warming will have serious consequences for humans and the environment. The IPCC Special Report on Global Warming of 1.5 °C (2018) included detailed analysis of the probable differences in impact of "limiting global warming to 1.5 °C compared with target="_blank">2 °C", warning that a target="_blank">2 °C temperature increase would worsen impacts that include extreme weather, Arctic sea ice decline, rising sea levels, coral bleaching, and ecosystem loss.
The impact of target="_blank">climate change is not uniform: for example, land regions tend to warm faster than ocean regions. NASA has modeled predicted changes in six key target="_blank">climate variables: air temperature, precipitation, relative humidity, wind speed, and short- and longwave solar radiation, with particular attention to their impacts on heat stress and fire weather. NASA's NEX-GDDP-CMIP6 data set models impact at a fine-grained spatial scale, which can be used to identify key risk areas and develop adaptation and mitigation action plans for specific regions. Above the target="_blank">2 °C threshold, dangerous and cascading effects are predicted to occur, with many areas experiencing simultaneous multiple impacts due to target="_blank">climate change.
As of 2022, the UN Environment Programme reported that countries have not met their target="_blank">climate goals to date. As a result the UN Framework Convention on target="_blank">Climate Change predicts a likely increase between target="_blank">2.1 and target="_blank">2.9 °C in temperature by 2100, exceeding the target="_blank">2 °C target="_blank">climate target. Some scientists suggest that the development of decarbonization technologies may offer a way to reverse the accumulation of CO2 in the atmosphere. Even if temperatures increase above target="_blank">2 °C, it may become possible to halt or reverse increases by late in the century and bring CO2 levels back to the levels identified by the Paris target="_blank">climate agreement. This type of scenario is referred to as an "overshoot pathway". Achieving such an outcome will require multigenerational management over many decades.




See also


Anthropocene
target="_blank">Climate target
Keeling Curve
Eco-sufficiency




References

Kata Kunci Pencarian:

• Konvensi Kerangka Kerja Perubahan Iklim Perserikatan Bangsa-Bangsa
• Globalisasi
• Kuala Lumpur
• Bartolomeus I dari Konstantinopel
• 2 degree climate target
• Climate target
• Climate change
• Paris Agreement
• Six degrees of separation
• The Age of Stupid
• United Nations Climate Change Conference
• Climate change scenario
• 2023 United Nations Climate Change Conference
• United Nations Framework Convention on Climate Change