How could you modify an Arctic Fox so that it could survive in higher temperatures?

I have a project, and i am supposed to choose a problem caused by global warming and an animal that is affected by it. I chose the melting glaciers of arctic regions, and the animal is the Arctic Fox. Now, i need to know what gene, microbe, or cell could be engineered into the Arctic Fox's DNA to help it survive the global warming problem. Please Please Please help me