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🚗 | Installed EV quick charger at post office Japan Post and TEPCO cooperate

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Installed EV quick charger at post office Japan Post and TEPCO cooperate

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In addition, the management resources and know-how of both companies will be utilized to promote efforts that contribute to regional carbon neutralization and strengthening resilience in the event of a disaster.

Japan Post, Japan Post, and TEPCO Holdings set up a quick charger for electric vehicles (EV) at the post office on April 4 ... → Continue reading


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Carbon neutral

Carbon neutral (English: Carbon neutral)Environmental chemistryOne of the terms.In JapaneseCarbon neutralSay.Excreted when producing something or performing a series of artificial activitiescarbon dioxideThe concept that the amount of carbon dioxide absorbed is the same.

According to the definition of the carbon offset system of the Ministry of the Environment, "greenhouse effects within the range where it is generally considered reasonable for members of society such as citizens, companies, NPOs / NGOs, local governments, and governments to take responsibility A project to recognize gas emissions and make proactive efforts to reduce them, and to purchase "credits" or realize emission reduction / absorption elsewhere for emissions that are difficult to reduce. It means to make up for all the emissions by carrying out activities and activities. "[1].

the term

"Carbon negative" refers to a state in which the amount of greenhouse gases absorbed by plants and the sea is greater than the amount of greenhouse gases emitted by human activities. When reducing (especially carbon dioxide), it means that it absorbs more than it emits.Carbon positive (carbon positive) ”, the former is also called“ carbon minus ”in Japan.


For example,plantBody (Stem-leaf-rootEtc.) are allOrganic compound(carbonatomIn the basic skeleton of the structureCompound). When the plant grows from a seedphotosynthesisByatmosphereIncarbon dioxideIt takes in the carbon atoms of the plant to make organic compounds and makes the body of plants. Therefore, even if the plant is burned to generate carbon dioxide, the carbon atoms in the carbon dioxide emitted into the air are the carbon atoms that originally existed in the air, so the carbon dioxide in the atmosphere is taken in by the plant. It does not affect the increase or decrease of the total amount. Therefore, it is called carbon neutral (carbon dioxide = neutral to the carbon cycle).

The difference between carbon neutral and non-carbon neutral
Carbon neutralCarbon negative
(Not carbon neutral)
Emission of carbon into the atmosphereYesYes
Absorption of carbon from the atmosphereYes (fast, regenerates in decades from plant sprout to maturity)Almost none (very slow, average hundreds of thousands to tens of millions of years)
Absorption method from the atmosphereThe next planted or growing plant absorbs the land where the plant wasPlants andCalcium carbonateUnderground and underwaterAccumulationSuch(Biosphere,Atmosphere(Limited to those who have completely withdrawn from)
Main examplePlant-derived raw materialsFossil fuel, Low raw materials

Strictly speaking, carbon neutral is based on the amount of carbon dioxide emitted by the combustion and decomposition of plant-derived fuels and raw materials, and the amount of carbon dioxide absorbed by the original plant during the growth process (emission amount). Absorption amount) is the same amount. Here, when the original plant produces carbon absorbed from other than the atmosphere (underground, etc.) during the growth process, carbon that is fixed to the ground during the growth process due to defoliation, etc., and plant-derived fuels and raw materials are manufactured. The carbon left over after being commercialized is not taken into consideration, but even if it is taken into consideration so far, it will not become carbon negative.

Current,Global warmingThe progress of the process and its effects have become a problem. One of the main causes of global warming is that the concentration of carbon dioxide in the atmosphere is rising, and there is a movement to suppress the progress of global warming by suppressing the rise in carbon dioxide concentration. is there. In this movement, the concept of carbon neutral has come to appear frequently.


There are three major problems with carbon neutrality.

The first is that even if a (carbon-neutral) plant-derived fuel is produced and used, "if even a small amount of fossil fuel is used in the manufacturing and transportation process, the amount of emissions will increase." All processes such as plant cultivation, felling, manufacturing and transportationProduct life cycleHowever, considering the amount of emissions and absorption throughout the life cycle, it becomes carbon neutral only when both are the same amount. As will be described later, fossil fuels are not considered to be carbon-neutral because there are few means to return the carbon dioxide emitted by burning fossil fuels to the ground and it takes a long time, and most of the carbon dioxide emitted by burning fossil fuels is I think it will remain in the atmosphere. Therefore, if fossil fuels are used even a little, "carbon dioxide capable of warming the earth for a long period of time" will stay in the atmosphere for a long time. In fact, it has been pointed out that bioethanol produced in the United States uses a large amount of fossil fuel at the production stage, which in turn increases the environmental load. as a result,Life cycle assessmentTo achieve carbon neutrality through再生 可能 エネルギーIt is necessary to take multifaceted measures such as introducing.

The second is that carbon neutrality requires regenerative power (reproducibility). Here, the reproductive power (reproducibility) is the "ability (property) of quickly and surely backfilling carbon dioxide produced by burning and decomposing plant-derived products into the ground." Specifically, it is necessary to properly manage forests and farms that produce raw materials for plant-derived products, and to maintain the cultivation and growth of plants. If this is not done, plant-derived fuels, like fossil fuels, will retain "carbon dioxide capable of warming the earth for a long period of time" in the atmosphere for a long time.

The third is the issue of land. Expanding carbon neutrality and converting fossil fuels and raw materials to plant-derived fuels and raw materials will require vast land for growing and conserving plants. The area required for carbon neutrality (described later) at the national level isCarbon footprint(Ecological footprint) Can be expressed. For example, in Japan, it is said that 7 ha, which is about seven times the national land area, is further required (when the efficiency of plant-derived fuel and raw materials is the same as that of fossil fuels and raw materials). It is said that 269.7gha, which is 1.2 times the total area of ​​the forest, is required (when the efficiency of plant-derived fuel and raw materials is the same as that of fossil fuels and raw materials), and it is difficult to cover all of them. In order to improve this, it is necessary to adopt plants with carbon dioxide absorption capacity and fast growth cycle, and to improve the utilization efficiency of fuels and raw materials to improve biological productivity.

The true meaning is to offset the amount of carbon dioxide emitted by the nation or the entire earth by planting trees so that the same amount of carbon dioxide that is normally excessively emitted at present can be absorbed. It is carbon neutral in. For this reason, it is not easy to achieve carbon neutrality.ノルウェーIs aiming for carbon neutrality on a national basis (Later) Corresponds to this.

Status of efforts

Looking at recent movements, it is derived from plants that are close to carbon neutral.Biomass ethanolEtc. are used,sustainabilityAfter consideringfirewood・ ・ Plant-derived fuels such as wood pellets are used. In addition, it is incinerated after disposal and emits carbon dioxide, but there is almost no absorption.oilOf originPlasticAs an alternative tocornMade fromBio plasticIs manufactured.

2007January,ノルウェー OfJens StoltenbergThe prime minister is carbon neutral2050By then, it has set policy goals to be realized at the national level. It is said that this is the first time such a policy has been decided at the national level. Also, in December of the same year,Eur-lex.europa.eu eur-lex.europa.eu OfOscar Arias SanchezThe president2021By then, it announced its goal of achieving national-level carbon neutrality.

OverseasNike,Google,Yahoo!,Marks & Spencer,Hongkong and Shanghai Banking Corporation (HSBC) ,DellMajor companies such as Japan have made their own "Carbon Neutralization Declaration" and are working to reduce greenhouse gases.[3][4][5]. Even in Japan,Green powerCompanies are reducing greenhouse gases using certificates. However, the Ministry of the Environment is considering a handling policy for green power certificates, as some say that they lack additional elements.


In recent years, as a carbon-neutral energy sourceBio ethanolDemand is rising rapidly. This has created food and energy resource struggles in the grain market, creating new global challenges such as rising grain prices and the resulting hunger crisis for the poor.


[How to use footnotes]
  1. ^ Ministry of the Environment Carbon Offset(Retrieved September 2021, 4)
  2. ^ "Japan Fireplace Stove Association-Fireplaces and wood stoves that are friendly to both people and the environment". 2021th of February 4Browse.
  3. ^ CARBON & ENERGY | Nike Purpose(Retrieved September 2021, 4)
  4. ^ Our Commitments | Google Sustainability (2020/09/14)(Retrieved September 2021, 4)
  5. ^ Becoming a net zero bank | HSBC Holdings plc(Retrieved September 2021, 4)

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