You should have a .env file in the root of the project containing the following variables:
REACT_APP_API_KEY=a359a042fe918e1ad8eb21795b23e814
REACT_APP_API_PATH=https://api.openweathermap.org/data/2.5/weather?q=
# This is the public MapBox token giving access to the tileset used in W2E
REACT_APP_MAPBOX_TOKEN=pk.eyJ1IjoibWJlbmtyYW91ZGEiLCJhIjoiY2wwaHdubzgxMGIwaTNqcDU5eWZhZHJzaSJ9.ls1fn4Kged2itpsSrK_aOA
Execute the following commands:
$ yarn
$ yarn run start