Global investment in cleaner energy sources has more than quadrupled over the last 10 years. But more is needed. The alternative could be pollution damage of several trillion dollars worldwide.
Green party co-leader Robert Habeck is touring eastern Germany ahead of crucial state elections. The region is rough terrain for the liberal Greens, far away from the urban centers where most of their supporters reside.
From black clothes worn by Hong Kong demonstrators to orange banners at rallies in Ukraine or green scarves accompanying protests in Iran, here's how colors are adopted to represent the hopes of a movement.
The German government wants to promote a culture of innovation to develop CO2-neutral aviation. Chancellor Merkel has said Germany must develop more alternative fuel sources, including hydrogen-based energy technology.
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