Environmental Factors Flashcards
(158 cards)
planetary boundaries- processes that regulate the stability and resilience of the earth system
4/9 planetary boundaries have been crossed as a result of human activity:
- climate change
- loss of biosphere integrity
- land-system change
- altered biogeochemical cycles
environmental issues:
a. climate change
b. pressure on natural resources
c. pollution, waste and a circular economy
Climate change
one of the most complex issue facing us today and involves many different dimension, including:
- science
- economics
- society
- politics
- moral and ethical questions
main man-driver: rising emission of greenhouse gases
IPCC intergovernmental panel on climate change in 2018 estimated human activities caused approx. 2C of global warming above pre-industrial levels
global warming is likely to reach 1.5c between 2030-2052.
limiting warming to 1.5 instead of 2 by the end of this century could reduce ‘climate-related risks to health, livelihoods, food security, water supply, human security and economic growth’
dismal 惨淡theorem - martin weitzman
std cost-benefit analysis is inadequate to deal with the potential downside losses from climate change.
Economist Nicholas Stern argued that moral considerations warrant the use of low discount rate when assess future climate damages
thrust of stem and weitzaman arguments is that
the issue of how much society should invest today in order to safeguard a livable climate in the future requires a different- mathematical and ethical - treatment to std economic problems like “would you prefer to receive 10 today or 100 in one year”.
responding to climate change in 2 main approaches:
- reducing and stabilizing the levels of heat-trapping GHGs in the atmosphere
- climate change mitigation - adapting to the climate change already taking place and increasing climate change resilience
(climate change adaptation)
climate change mitigation
human intervention that involves reducing the sources of GHG emission or enhancing the sinks that store these gases.
Goal:
- avoid significant human interference with the climate system
- stabilize GHG levels in a time frame sufficient to allow ecosystems to adapt naturally to climate change
- to ensure that food production is not threatened
- enable economic development to proceed in a sustainable manner
aim of the international Paris Agreement on climate change:
to hold the increase in the global average temperature to well below 2C above pre-industrial levels and pursuing efforts to limit the temperature increase to 1.5C above pre-industrial levels by the end of the century.
examples of mitigation strategies - adaption and policies to promote sustainability across diff. areas such as:
- Energy deploying renewable energy sources
- Buildings
retrofitting buildings to become more energy efficient and using building materials and equipment that reduce buildings’ carbon footprint
-Transport
adopting more sustainable transportation and infrastructure, particularly in cities, but also decarbonizing shipping, road and air transport.
- land use and forestry
- agriculture
- carbon pricing - implementing carbon reduction policies which penalize heavy emitters and promote GHG emission reductions in the form of either a carbon tax or cap-and-trade mechanism
- industry and manufacturing
the higher the ambition of mitigation policies, the higher the required upfront investment.
2020 UN emission gap report: 3.2c warnmer by the end of this century, even with full implementation of unconditional nationally determined contributions (NDCs) under the paris agreement.
COVID-19 pandemic led to the largest recorded drop in yearly CO2 emission - of circa~ 7%
green pandemic recovery could shave up to 25% off the emissions we would expect to see in 2030 with implementation of uncontaionql NDCs - bring the world close to 2c pathway
Climate change adaptation and resilience
the faster the climate changes, the more challenging it is to adapt.
wold bank aptly 恰如其分 describes adaptation and resilience as ‘two sides of the same coin’.
examples of adaptation strategies include a variety of development plans on how to deal with:
- protecting coastlines and adapting to sea-level rise
- building flood defense
- managing land use and forestry practices
- planning more efficiently for scarce water resources
- developing drought resilient crops 抗干旱的农作物
- protecting energy and public infruasturcture
- developing clean cooling systems
some of the most effective climate policies contribute to both adaptation and mitigation simultaneously
close to half of the global production of iron ore and zinc is estimated to be in areas facing high flood risk
representing 80% of global GDP, cites are heavily exposed to climate change risks in the forms of:
- sea level rise
- extreme weather events, such as flooding and drought
- increase in the spread of tropical diseases
useful best practices of various cities’ climate adaptation strategies include:
- incorporating flood risk into building design and planning for enhanced water absorption rates into city infrastructure
- modeling the impact of natural disasters on energy supply
- analyzing the resiliency to disruption of food supply systems
potential benefits: the Global Commission on Adaptation in 2019 estimated that circa US$2tn of investment in adaption measures would result in an over US$7tn return in avoided costs and other benefits.
Climate bonds Initiative published the 1st Climate Resilience Principles in late 2019
- provide a framework for developing location-specific climate resilience measures and financing them in the green bond market
a frame and principles for climate resilience metrics in financing operations
which provide guidance on how to create effective climate resilience projects and how to measure direct outcomes and wider system impacts
Pressures on natural resources
relationship b/w businesses and natural resources is becoming increasing important due to dramatically accelerating biodiversity loss and less secure access to nature resources.
Natural resources cover:
fresh water
biodiversity loss
land use
forestry and marine resources
gov’t and business are having to deal with increased pressure on natural resources, caused by:
- population growth
- health improvements leading to people living longer
- economic growth
- the accompanying increased consumption in developed and emerging economics
leading to risk of resource scarcity
Depletion消耗 of natural resources
tech innovating and moving from a linear to a circular economy has the potential to reduce the need for virgin resources.
Jevons paradox
relative improvements in efficiency may be offset by increased consumption of a given product.