(Upload on December 28 2021) [ 日本語 | English ]

Eco (エコ)

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

Eco (エコ)

eko, phonological translation): Japanglish
The word is derived from the abbreviation of "ecology" or 'economy' in Japan. However, the meaning of eco is totally different from the meaning of ecology. Eco means 'saving energy through ecological and/or economical ways.

The meaning of eco in Japanese

Environmental problems solved or solving by using ecological and/or economical techniques
Waste problem
Population growth and food amount

  Food    Efficiency  Area for       Global        Ratio to
          of solar    supporting     population    global
          energy (%)  a person (m2)  supported     population
                                     by the food
                                     (× billion)

  Potato    0.10           600           760         21
  Cereal    0.05         1,200           380         11
  Milk      0.04         1,500           300          8
  Poak      0.015        4,000           110          3
  Egg       0.002       30,000            15          0.4

a: area for food production = 45,600,000 km2
b: assmuming a population of 36 billion

UN Sustainable development goals (SGDs, 持続可能な開発目標)

Transforming our world: the 2030 agenda for sustainable development
  1. End poverty in all its forms everywhere
  2. End hunger, achieve food security and improved nutrition and promote sustainable agriculture
  3. Ensure healthy lives and promote well-being for all at all ages
  4. Ensure inclusive and equitable quality education and promote lifelong learning opportunities for all
  5. Achieve gender equality and empower all women and girls
  6. Ensure availability and sustainable management of water and sanitation for all
  7. Ensure access to affordable, reliable, sustainable and modern energy for all
  8. Promote sustained, inclusive and sustainable economic growth, full and productive employment and decent work for all
  9. Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation
  10. Reduce inequality within and among countries
  11. Make cities and human settlements inclusive, safe, resilient and sustainable
  12. Ensure sustainable consumption and production patterns
  13. Take urgent action to combat climate change and its impacts*
  14. Conserve and sustainably use the oceans, seas and marine resources for sustainable development
  15. Protect, restore and promote sustainable use of terrestrial ecosystems, sustainably manage forests, combat desertification, and halt and reverse land degradation and halt biodiversity loss
  16. Promote peaceful and inclusive societies for sustainable development, provide access to justice for all and build effective, accountable and inclusive
  17. Strengthen the means of implementation and revitalize the global partnership for sustainable development
2015.09 Transforming our world: the 2030 agenda for sustainable development

environment - economics - society

Environmental pollution (環境汚染)

Pollution (公害)

Kogai (公害) can not be translated directly into English.

Air pollution (大気汚染)

Water pollution (水質汚染)

Indicator of water quality
DO (dissolved oxygen)
COD(chemical oxygen demand)
BOD(biochemical oxygen demand)

Soil pollution (土壌汚染)

[ Biodiversity Convention ]

Ecosystem services (生態系サービス)

The benefits of human obtaining from ecosystems
→ MA (Millennium Ecosystem Assessment)
Four categories
  • Supporting services (基盤サービス), e.g., photosynthesis and nutrient cycling
  • Provisioning services (供給サービス), seafood, transportation and genetic resources
  • Regulating services (調整サービス), affecting climate, floods, disease, wastes and water quality
  • Cultural services (文化サービス), providing recreational, aesthetic and spiritual benefits
Environmental policy toolkit through the mnemonic of the "Five P's" (Salzman 2013):


Ecosystem service valuation database, ESVD
The database quantifies the four categories of ecosystem services

Background: TEEB* valuation database

* the economics of ecosystems and biodiversity


Energy problems (エネルギー問題)

EIA (Energy Information Administration, USA, 合州国エネルギー情報局)

IEO2019 (International Energy Outlook 2019): 49% of energry will be obtained from renewable energy by 2050

Electric generation (発電)

Power problems (電力問題)

Wind-power generation (風力発電)

Recently often called "wind power"
the use of air flow through wind turbines to provide the mechanical power to turn electric generators

alternative to burning fossil fuels → produces no greenhouse gas during operation

wind farms [problems]
wind power wind power
Offshore wind power (海洋風力発電)
US: just beginning (in 2019)
Europe: studies at offshore wind facilities indicate some bird and marine mammal species are displaced from project areas, but substantial uncertainty exists regarding the individual or population-level impacts of this displacement. Bird and bat collisions with offshore turbines are thought to be less common than at terrestrial facilities, but currently the tools to measure fatalities at offshore wind energy facilities are not available (Allison et al. 2019)
Environmental problems derived by wind power
  • noise, low-frequency wave
  • disaster, water quality
  • landscape
  • nature quality and quantity
  • wild bird

    collision death (bird strike)
    habitat loss and destruction (escape, barrier)

  • shadow flicker
  • others
Sensitivity map (センシティビティマップ)
  • measured spatial indication of where protected species are likely to be perturbed by change
  • does not create no-go areas
  • not indicative of species presence and absence
  • uses existing data
  • stakeholder involvement
  1. species selection
    terrestrial species
    species of conservation concern
    inclusion add value to the map
    sufficient data
  2. species sensitivity index
    • survival rate, flight manoeuvr, soaring, aerial foraging, ranging behavior, flocking, nocturnal flight activity, aerial display
    • site fidelity, range, sensitivity to displacement, habitat preference, available habitat
    • conservation status, biogeographic population
  3. calculating the sensitivity index
    species sensitivity score (SSS) =

    maximum conservation socre ×

    (averaged flight vulnerability scores +
    averaged habitat averaged flight vulnerability scores)

    characteristics often overlap (i.e. collinear)
    avoid inflation/stretching of range

  4. zoning of sensitivity → sensitivity mapping → disclosure

Nuclear problems (原子力問題)

1939.8.2 Einstein (US): Einstein–Szilárd letter

sent to the President Franklin D. Roosevelt
recommend to start US own nuclear program (≈ nuclear bomb) - Manhattan Project

1942 Manhattan Project (マンハッタン計画), USA

1943 Los Alamos National Laboratory (LANL) established

starting the development of atomic bomb

1955 EBR-1 accident in Idaho
1957.07.29 IAEA (nternational Atomic Energy Agency, 国際原子力機関)

International organization, with independently of the United Nations
Headquarters: Vienna, Austria
seeking to promote the peaceful use of nuclear energy and to inhibit its use for any military purpose, including nuclear weapons

1961 SL-1 (Stationary low-power reactor number one) accident

1968 Treaty on the non-proliferation of nuclear weapons, NPT (核兵器不拡散条約)

1979 Three Mile Island accident
1986 Chernobyl disaster
1990 Strategic Arms Reduction Treaty, START I: agreement in principle

1991.07 signing between USA and USSR

2011 Fukushima nuclear disaster

waste problem (ごみ問題)

Compost (コンポスト): organic matter that has been decomposed and recycled as a fertilizer and soil amendment.

organic solid waste (green waste)
animal manure and bedding
Human waste and sewage sludge

We make compost from fallen leaves in the gardens to use as leaf mold. Kojimachi Junior High School students and Tokyo Garden Terrace Kioicho collaborated on the wooden compost bin.



Portland Streetcar | Green Street Stormwater Facilities

Plants at Work

For your safety and
the health of the
plants, stay out
of the facility and
help keep it free
of litter.
Thank you!

The plants in this green street facility are at work keeping stormwater runoff out the city’s sewer system. During a rain, this facility collects stormwater from NE Martin Luther Jr Blvd. The plants and soil slow and filter the stormwater, before allowing it to soak gradually into the ground.
Stormwater runoff from NE Martin Luther King Jr Blvd enters the facility. → Plant roots and soil bacteria help break down stormwater pollutants. Roots, insects and worms widen spaces between soil particles to increase stormwater storage capacity.
→ During heavy rain, you may see some stormwater overflow back into the street. That water drains directly to the Willamette River.

Each year, this green street facility keeps
223,300 gallons
of stormwater out of the sewer system.

Green street facilities keep sotrmwater runoff out of sewers and local streams, replenish groundwater supplies, and create urban green spaces. Learn more at HP

Environmental Services
City of Portland
working for clean rivers

Food loss (フードロス)

2011 FAO: 1/3 food was lost or wasted every year worldwide

SDGs 12: responsible consumption and production

Def. food loss: the decrease in the quantity or quality of food resulting from decisions and actions by food suppliers in the chain, excluding retailers, food service providers and consumers

Food loss index, FLI (食品ロス指標)

Def. food waste: the decrease in the quantity or quality of food resulting from decisions and actions by retailers, food service providers and consumers

Food waste index, FWI (廃棄食品指標)