The environmental issue in this story is the issue of global warming. The society of Denmark has not been particularly instrumental in causing or creating this problem. Global warming is caused by the emission of greenhouse gasses, mainly from the use of fossil fuels. Denmark does, of course, use these fuels, but their population is so small that it is hard to say that they have done much to cause or create this problem.
The solution that is being proposed for the problem is one that has been caused or created by Danish society to some degree. The Danish society is one of the world’s most environmentally conscious societies. This makes them more receptive to “green” initiatives. The Danish have a large network of windmills for electric power generating, one which produces about a quarter of their electricity. Because the country is very “green,” and because it is relatively small, it is a good place to try out this new system of using electric cars and having charging and battery-switching stations.
In this way, the society of Denmark has not really caused the environmental issue in this article, but it has had a hand in causing the proposed answer to this problem.