Silurian global events – at the tipping point of climate change

2007 ◽  
pp. 21-57 ◽  
Author(s):  
Mikael Calner
Keyword(s):  
Climate Change ◽  
Tipping Point ◽  
Global Events

scholarly journals Climate Change and Nutrition Security in Nigeria

2020 ◽  
Vol 24 (11) ◽  
pp. 1853-1860
Author(s):  
MO Ifeanacho ◽  
HO Okudu
Keyword(s):  
Climate Change ◽  
Atmospheric Temperature ◽  
Coastal Flooding ◽  
Nutrition Security ◽  
Long Period ◽  
Rural Livelihood ◽  
Food Shortages ◽  
Global Events ◽  
The Impact ◽  
Rising Sea Level

Climate change is a global reality and a major concern of many countries of the world. Its average impacts are the same globally but with some regional peculiarities. This paper reviewed the global events of climate change and its reality in Nigeria. It observed that the world’s climatic elements have been undergoing changing pattern for a long period. Its reality in Nigeria was seen in changing rain pattern, relative humidity, atmospheric temperature, rising sea level, coastal flooding, erosion, desertification and drought among other indicators of climate change. These events were viewed vis-à-vis their impacts on nutrition security. The paper related these events to such drivers of food insecurity as food shortages; increase in crop and animal diseases; shortage of portable water; poor sanitation; loss of rural livelihood and different forms of pollution-related diseases. Measures were suggested for integration into government programmes and policy that will help in mitigating and adapting to the impact of climate change on nutrition security Keywords: Climate change, nutrition security, mitigating, adapting, Nigeria

A Forested Wetland at the Tipping-Point: 17-Year, Demographic Evidence of Widespread Recruitment Failure Due to Climate Change

2021 ◽  
Author(s):  
Jonathan P. Evans ◽  
Sarah McCarthy-Neumann ◽  
Angus Pritchard ◽  
Jennifer Cartwright ◽  
William Wolfe
Keyword(s):  
Climate Change ◽  
Tipping Point ◽  
Forested Wetland ◽  
Recruitment Failure

scholarly journals Modeling Subtropical Forest Changes under Climate Change and Close-to-Nature Silviculture: Is There a Tipping Point in an Uncertain Future in Southern China?

2020 ◽  
Vol 12 (17) ◽  
pp. 6992
Author(s):  
Zhuo Wu ◽  
Erfu Dai ◽  
Wenchuan Guan
Keyword(s):  
Climate Change ◽  
Sustainable Forest Management ◽  
Southern China ◽  
Management Strategies ◽  
Timber Harvesting ◽  
Forest Harvesting ◽  
Tipping Point ◽  
Interactive Effects ◽  
Climate Change Scenarios ◽  
Harvesting Intensity

Subtropical forests face pressure from both rapidly changing climate and increasing harvest activity in southern China. However, the interactive effects of various spatial processes on forests are not well known. The objective of the present study was to answer the question of how forest aboveground biomass (AGB) changes under alternative climate change and harvesting scenarios and to determine whether there will be a tipping point for forest AGB before 2300. Our simulation results show that, although total forest AGB did not reach a tipping point before 2300 under possible climate change and harvesting scenarios, the slope of the total forest AGB showed a decreasing trend around 2100 and 2200. Moderate climate warming was conducive to AGB accumulation, except for in the high emissions Representative Concentration Pathway (RCP8.5) scenario. Our results also indicate that timber harvesting is adaptable to the accumulation of biomass under climate change scenarios. Harvesting intensity was a key variable affecting forest AGB more than harvesting frequency. Our findings will help develop more sustainable forest management strategies that can adapt to potential climate change scenarios, as well as determining the effectiveness of implementing alternative forest harvesting policies.

Prospects for renewable energy in 2017

2016 ◽  
Keyword(s):  
Climate Change ◽  
United States ◽  
Renewable Energy ◽  
Electric Power ◽  
Primary Source ◽  
The United States ◽  
Paris Agreement ◽  
Tipping Point ◽  
Content Type

Subject Prospects for renewable energy in 2017. Significance The United States and China, the world’s two largest economies as well as the largest carbon emitters, announced their ratification of the Paris Agreement in September. Earlier this year, prices for renewable energy in select regions set historic lows below fossil-fired plants. Renewable energy seems to have passed the tipping point towards gradual adoption as the primary source of electric power while also hopefully preventing catastrophic climate change.

Loss of Amazon rainforest resilience since the early 2000s

2021 ◽  
Author(s):  
Chris Boulton ◽  
Timothy Lenton ◽  
Niklas Boers
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Land Use Change ◽  
Carbon Cycle ◽  
Optical Depth ◽  
Tipping Point ◽  
Amazon Rainforest ◽  
Statistical Characteristics ◽  
Annual Rainfall ◽  
Action Science

<p>The resilience of the Amazon rainforest to both climate and land use change is of critical importance for biodiversity, regional climate, and the global carbon cycle. Some models project future climate-driven Amazon rainforest dieback (Cox et al. 2000) and others argue that land-use and climate change have already pushed the Amazon close to a tipping point of rainforest dieback and transition to savanna (Lovejoy & Nobre 2018, 2019). But competing effects between rising temperatures, changing precipitation patterns, and CO<sub>2</sub> fertilization, make the future of the Amazon uncertain. An alternative approach is to look for direct observational signals of changing rainforest resilience from timeseries analysis - here of remotely-sensed vegetation optical depth (VOD) (Moesinger et al. 2018), which correlates well with changes in broadleaf tree fraction coverage. Our results indicate that the Amazon rainforest has been losing resilience since the early 2000s, with statistical characteristics evolving consistently with critical slowing down on the way to a bifurcation-induced transition. Specifically, changes in lag-1 autocorrelation of VOD show that resilience is lost faster in regions with less mean annual rainfall. Parts of the rainforest that are closer to human activity are also losing resilience more quickly. Given observed increases in dry-season length, and expanding areas of land use change, the loss of Amazon rainforest resilience is likely to continue. Our results provide direct empirical evidence that the Amazon rainforest is losing stability, risking a sudden dieback that would have profound implications for biodiversity, carbon storage and climate change.</p><p> </p><p>References</p><p>Cox, P. M., Betts, R. A., Jones, C. D., Spall, S. A. & Totterdell, I. J. Acceleration of global warming due to carbon-cycle feedbacks in a coupled climate model. Nature 408, 184-187, doi:10.1038/35041539 (2000).</p><p>Lovejoy, T. E. & Nobre, C. Amazon Tipping Point. Science Advances 4, eaat2340, doi:10.1126/sciadv.aat2340 (2018).</p><p>Lovejoy, T. E. & Nobre, C. Amazon tipping point: Last chance for action. Science Advances 5, eaba2949, doi:10.1126/sciadv.aba2949 (2019).</p><p>Moesinger, L. et al. The global long-term microwave Vegetation Optical Depth Climate Archive (VODCA). Earth System Science Data 12, 177-196, doi:10.5194/essd-12-177-2020 (2020).</p><p> </p><p>This work was funded by the Volkswagen foundation and the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 820970.</p>

scholarly journals Climate Change and its Increasing Impacts in Nepal

1970 ◽  
Vol 3 ◽  
pp. 30-37 ◽  
Author(s):  
Madhav Karki ◽  
Pradip Mool ◽  
Arun Shrestha
Keyword(s):  
Climate Change ◽  
Action Plan ◽  
Climate Change Impacts ◽  
Leadership Role ◽  
Global Changes ◽  
Developed Country ◽  
Food And Nutrition ◽  
Global Events ◽  
Big Rivers ◽  
The Himalaya

There is a general agreement that Climate Change impacting Nepal rather disproportionately compared to its size and its own meagre contribution of the green house gases. However, given its location between two rapidly growing economies of India and China, Nepal cannot escape the rapidly increasing influence of climate and global changes. The rapidly retreating glaciers (average retreat of more than 30 m/year), rapid rise in temperature (>0.06°C), erratic rainfalls and increase in frequency of extreme events such as floods and drought like situation are some of the effects Nepal is facing during the last few years. Most of the big rivers of Nepal are glacier-fed and its main resources of water and hydroelectricity will be seriously affected due to the ongoing changes in glacier reserves, snowfall and natural hazards. Nepal has to prepare itself to try and mitigate these effects if possible and if not adapt to them to reduce their impacts on our lives and livelihoods. Nepal is largely a mountainous country and current indications are that the mountain regions are more vulnerable due to increased warming trends as well as extreme changes in altitude over small distances. These alarming trends not only make Nepal's major sectors of economy such as agriculture, tourism and energy more vulnerable but also endanger the health, safety and wellbeing of Nepali people. Biodiversity - the other important resources of Nepal is also being affected as invasive species will spread fast and useful medicinal, food and nutrition related plants may disappear. Climate change is becoming already dangerous to our survival and we have to do everything possible to prevent it being catastrophic to us. The globally accepted strategy to contain disastrous climate change impacts is Adaptation and Mitigation. For a least developed country such as Nepal, adaptation should be the priority. Nepal is currently preparing National Action Plan on Adaptation (NAPA) which should be made as comprehensive and topical as possible. Well coordinated, quick and serious implementation of NAPA will be extremely important to mitigate and adapt to the growing impacts of climate change in Nepal. Nepal's central location in the Himalaya portends the fact that it is the prime target country of climate change impacts and calls for it to play a leadership role at least in showing political will and playing a responsible role in global events such as the COP-15 at Copenhagen.   DOI: 10.3126/init.v3i0.2425 The Initiation Vol.3 2009 p.30-37

Are We at a Climate Tipping Point?

2020 ◽  
Vol 119 (813) ◽  
pp. 34-36
Author(s):  
Pamela McElwee
Keyword(s):  
Climate Change ◽  
Tipping Point ◽  
Political Leaders

Political leaders once again failed to commit to adequate action against climate change, but its increasingly visible impacts have galvanized citizen activists.

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