Choosing to fly comes at a high price in terms of emissions. Airlines say we might soon change that with zero-emission, hydrogen-powered aircraft. But is that a realistic scenario?
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The world already has the technologies to bring net emissions in the energy system down to zero — and doing so will boost employment, researchers say.
Building sites produce emissions and air pollution. Cities, developers and construction machinery manufacturers are looking for ways to clean them up.
As Germany plans a pathway to a low-carbon economy, experts argue over whether to replace its huge fossil hydrocarbon imports with imported renewable hydrogen or instead rely entirely on hydrogen made in Germany.
If aviation were a country, it would be among the world's top CO2 emitters. The sector has committed to reducing its carbon footprint, but the technology it's banking on for low-carbon travel is far from being developed.
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