> For the complete documentation index, see [llms.txt](https://paramita-inc.gitbook.io/sinra/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://paramita-inc.gitbook.io/sinra/japanese/5-sinranoregenerative-nftno/51.-gou-ru-dan-wei.md).

# 5-1. 購入単位

自然資源が保有する多様な価値のうち、初期は温室効果ガスの削減に寄与する価値（＝カーボンクレジット）を環境価値として取り扱います。カーボンクレジットの単位は「t-CO2」（トン）となり、SINRAのRegenerative NFTを購入する際にも「t-CO2」を自身で選択してmintしていただきます。

カーボンクレジットの取引上、取引単位を1 t-CO2とします（整数での取引とします）。


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