There are two reasons that are particular to Germany here. In the wake of the Fukushima disaster, there were heavy protests in Germany that made the country shut down all its nuclear power plants permanently, which was more than a dozen plants. This means that a "bridge" technology needed to be found until the entire economy could be made to use renewables at some point in the future, and coal was readily available. Secondly, coal has a relatively good image among Germany's working class. Coal mines used to offer employment to lots of otherwise underprivileged Germans, especially in the Ruhr region of Western Germany, and coal mining continues to this day.

Of course, things are changing in Germany. In the last year, there were week-long left-wing protests against clearing an old-growth forest for coal mining, which brought attention to the issue and might trigger some change. However, Greenpeace Germany's suggestion to shut off coal and switch to burning natural gas instead is met with some resistance across the political spectrum, given that Germany cannot procure gas from anywhere but Russia, and EU-Russian relationships are somewhat cool recently.

We'll see where we end up, I guess. In any case, Germany is still a much greener country than e.g. the United States, who recently stopped promoting climate protection policies altogether. Until we have convinced the United States that they need to protect the environment, there is scarce leverage (and scarce reason) to persuade the developing countries.