stop idling campaign

When my friend came to Japan, he asked me why Japanese buses stopped their engins during the traffic jams, especially in Kyoto. I told him because we kept trying to stop idling as a campaign. We have an important problem of environment and need to stop the global warming demage, so several bus companies have the campaign. He understood the reason and he sid, it was a good idea and we should think about the problem and what we could do.