---
title: C3DS
emoji: 🌍
colorFrom: blue
colorTo: green
sdk: static
pinned: false
---

# Centre for Climate Communication & Data Science (C3DS)

Research group developing AI tools for understanding climate communication at scale.

## CARDS: Climate Contrarianism Claim Detection

We build and release models that detect and classify **100+ types of climate contrarianism claims** in text, based on the peer-reviewed CARDS taxonomy:

> Coan et al. (2026). *Large language model reveals an increase in climate contrarian speech in the United States Congress.* Communications Sustainability. [doi:10.1038/s44458-025-00029-z](https://www.nature.com/articles/s44458-025-00029-z)

## Models

### Full weights (for vLLM / Transformers)

| Model | Parameters | Link |
|-------|-----------|------|
| CARDS-Qwen3.5-4B | 4B | [C3DS/CARDS-Qwen3.5-4B](https://huggingface.co/C3DS/CARDS-Qwen3.5-4B) |
| CARDS-Qwen3.5-9B | 9B | [C3DS/CARDS-Qwen3.5-9B](https://huggingface.co/C3DS/CARDS-Qwen3.5-9B) |
| CARDS-Qwen3.5-27B | 27B | [C3DS/CARDS-Qwen3.5-27B](https://huggingface.co/C3DS/CARDS-Qwen3.5-27B) |

### GGUF (for Ollama / llama.cpp / LM Studio)

| Model | Q4_K_M | Q8_0 | Link |
|-------|--------|------|------|
| CARDS-Qwen3.5-4B | 2.7 GB | 4.2 GB | [C3DS/CARDS-Qwen3.5-4B-GGUF](https://huggingface.co/C3DS/CARDS-Qwen3.5-4B-GGUF) |
| CARDS-Qwen3.5-9B | 5.6 GB | 9.8 GB | [C3DS/CARDS-Qwen3.5-9B-GGUF](https://huggingface.co/C3DS/CARDS-Qwen3.5-9B-GGUF) |
| CARDS-Qwen3.5-27B | 16 GB | 28.6 GB | [C3DS/CARDS-Qwen3.5-27B-GGUF](https://huggingface.co/C3DS/CARDS-Qwen3.5-27B-GGUF) |

### Ollama (one-line install)

```bash
ollama run exec3ds/cards-qwen3.5        # 4B default
ollama run exec3ds/cards-qwen3.5:9b
ollama run exec3ds/cards-qwen3.5:27b
```

## Quick start

Just give it text — the system prompt and chain-of-thought reasoning are built in:

```bash
ollama run exec3ds/cards-qwen3.5 "CO2 is just a trace gas. The sun drives climate."
```

## Links

- [Paper (Nature Communications Sustainability)](https://www.nature.com/articles/s44458-025-00029-z)
- [Ollama models](https://ollama.com/exec3ds/cards-qwen3.5)
- [GitHub](https://github.com/project-c3ds/cards-2pO-paper)