Players
2 players
Time
10–15 minutes
Objective
Win the most cards by playing lower carbon emission activities than your opponents.
Deck
- A single deck of Activity Cards
- Each card includes:
- Activity (e.g., Driving, Flying, Biking, Solar Power)
- A carbon score (number value)
Setup
- Shuffle the deck
- Deal all cards evenly to players (face-down)
- Players do not look at their cards
- Keep cards in a stack in front of you
Gameplay
1. Flip
All players flip their top card at the same time
2. Compare
- The card with the LOWEST carbon score wins
- (Reverse of traditional War)
3. Collect
- Winner takes all played cards
- Place them at the bottom of your stack
Carbon Clash (Tie Rule)
If two or more players tie:
- Each tied player places 1 card face-down
- Then flips 1 card face-up
- Compare again → lowest carbon wins all cards
Learning Twist
Before taking the cards, each tied player must say one way to reduce emissions related to their activity
- If they give a valid answer → continue
- If they can’t → they lose 1 extra card to the winner
End of Game
Choose one:
- Play until one player has all the cards
OR - Set a timer → player with the most cards wins
Key Rules to Remember
- Lower carbon = better
- Always flip at the same time
- Only use the card deck—no board, tokens, or extras
Key Cards
| Activity | Carbon Score |
| Walking | 0 |
| Biking | 0 |
| Solar Power | 5 |
| Wind Energy | 5 |
| Public Bus | 40 |
| Train | 45 |