Add GPT-2-climate
### Model description

GPT-2 was pretrained on a climate change-related corpus consisting of over 500 thousand abstracts of top climate scientists' articles from trustable sources covering large temporal and spatial scales. The climate-gpt-2 model could further be used for downstream tasks in the climate change domain, including Classification, Fact-checking, and text generation (climate change-related texts).

paper: https://www.climatechange.ai/papers/neurips2022/27

### Open source status

- [X] The model implementation is available
- [X] The model weights are available

### Provide useful links for the implementation


@seashr
Hey @saeedashraf are we expecting to work on integrating this in Hugging Face? If so then I'll be interested in helping out.<|||||>Hi Manish,

Ye ... we would like to fully integrate this.


On Mon, Jan 9, 2023 at 5:47 PM Manish ***@***.***> wrote:

> Hey @saeedashraf <https://github.com/saeedashraf> are we expecting to
> work on integrating this in Hugging Face? If so then I'll be interested in
> helping out.
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<|||||>Okay, so the GPT model itself is available in HuggingFace. Do we wish to incorporate this dataset? or just the training objective?