チラシ対策ステッカー

Michael
January 5th, 2021

A few years ago, I weighed the flyers that would accumulate in my mailbox each month. Here are the results.
数年前、１ヶ月間に郵便箱に投函されるチラシの重さを計ったところ、以下の結果がでました。

5月 | May: 575g
6月 | June: 744g
7月 | July: 632g

My friends, who were also living in apartments in Tokyo, had similar results, with monthly flyer accumulation exceeding 500g per month.
東京のアパート住まいの友人たちに同じように計ってもらったところ、全員が月500グラム以上のチラシを受け取っていました。

Assuming that the average household in Tokyo receives ~600 grams of flyers in their mailbox every month or some ~7.2kg of paper per year, this would add up to 43 million kilograms of paper and 7.5 million kilograms of ink used to produce flyers distributed in Tokyo alone, resulting in the deforestation of around ~5 million trees.
東京の一世帯が受け取るチラシが月約600g（年間約~7kgの紙）の場合、東京だけでもチラシの製作に4,300万kg（4,300トン）の紙と750万kg（7,500トン）のインクを利用することになります。これは最大約500万本の木を伐採していることになるのです。

Most of us place these flyers directly into the trash.
殆どの場合、チラシは利用されることなくゴミになってしまいます。

More than 2,500 of our listeners have received the anti-chirashi sticker via our website, potentially saving an estimated 9,180kg of paper or 242.5 trees per year.
すでに2,500人以上のリスナーの方達が番組ウェブサイトから「チラシお断り」ステッカーを受け取っています。これによって毎年約9,180kgの紙（木242.5本分）を救うことになります。

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Individual Savings Calculation

600g / mo = 7.2kg / year
7.2 x 0.15 = 1.08kg ink
7.2 x 0.85 = 6.12kg paper

6.12kg x 0.60 (40% from recycled) = 3.672kg / year in new paper
3.672kg x 0.44 = 1.62 reams
1.62 reams / 16.67 reams (1 tree) = 0.097 trees

0.097 x 2,500 = 242.5 trees saved every year

Scaled Calculation

46,862,900 (Japan households) x 7.2kg / yr
(assuming households @ Tokyo チラシ level)
337,412,880kg / yr

6,946,000 (Tokyo households) x 7.2kg/yr
50,011,200kg/yr of chirashi

50,011,200kg * .85 = 42,509,520kg of paper
50,011,200kg * .15 = 7,501,680kg of ink

42,509,520kg / 0.4424 = 96,088,427 reems
96,088,427 reems / 16.67 reems = 5,764,153 trees (Tokyo)

40% utilization recycled materials = 5,764,153 (0.6) = 3,458,492 trees

Recycling Efficiency

Recovery rate: 60% (2015)
60% of paper used is recovered for potential reuse

Utilization rate: 40.2% (2015)
40.2% of paper production is using recycled pulp

Government report on paper recycling & source
http://www.prpc.or.jp/linkfile/english-paperrecycling.pdf

“Recovery of printing & communication paper, inclusive of the aforementioned advertising inserts, was approximately 60%.”

“In 2015, the consumption of recovered paper in paper manufacture stood at 40.2%”