TITLE: ASCII/UTF8 terrestrial carbon cycle diagram
DATE: 2021-06-17
AUTHOR: John L. Godlee
====================================================================


I have been thinking about the carbon cycle. I decided to try and 
make a simple terrestrial carbon cycle diagram using only ASCII 
art. It's completely useless, but was quite fun to make. There's 
two versions, one which uses some UTF8 characters, and another 
which only uses ASCII characters.

                   
┌─────────────────────�
�───┐
                   │NPP = GPP - Ar           │
                   │NEP = NPP - Hr           │
                   │NBP = NEP - harvest, fire│
                   
└─────────────────────�
�───┘
    ┌───┐ ┌───┐       ┌───┐         
Harvest
    │GPP│ │Ar │       │Hr │         +Fires
    └─┬─┘ └─▲─┘       ▲─▲─▲         ' 
'▲'  '
      │     │         │ │ │        ' ' │ ' '
     _▼_____│_        │ │ │        ^^^^│^^^^
     \       /        │ │ │        \^  ^  ^/
      \ NPP────────┐ ┌┘ │ └┐        \^ 
^ ^/
       \   /       │ │  │  │         \^^^/
        │ │        │ │  │  │          │^│
        │ │        │ │  │  │          │^│
        │ │        ▼ │  │  │         ^│^│^
    
════╬═╬════════""""═╬═######═�
��════╩═╩═══
      ┌─┤ ├─┐     Litter│  Wood
      ┼ │ │ ┼           │
     ╱│╲   
╱│╲────────▶SOC─────────�
�───────▶DOC

                   +-------------------------+
                   |NPP = GPP - Ar           |
                   |NEP = NPP - Hr           |
                   |NBP = NEP - harvest, fire|
                   +-------------------------+
    +---+ +---+       +---+         Harvest
    |GPP| |Ar |       |Hr |         +Fires
    +---+ +---+       +---+         ' '^'  '
      |     ^         ^ ^ ^        ' ' | ' '
     _v_____|_        | | |        ~~~~|~~~~
     \       /        | | |        \'  '  '/
      \ NPP--------+  | | |         \' ' '/
       \   /       |  | | |          \'''/
        | |        |  | | |           |'|
        | |        |  | | |           |'|
        | |        v  | | |          '|'|'
    ----| |--------""""-|-######------+-+---
      --| |--     Litter|  Wood
      | | | |           |
     /|\   /|\-------->SOC----------------->DOC