Delays, waiting to land or resorting to longer flight paths because of busy air corridors are just three examples of increased jet fuel consumption.
"Climate change has not stopped and there is no vaccine against the climate crisis," said Monika Langthaler, director of the Austrian World Climate Summit.
The "catastrophic" decline in wildlife has been caused by deforestation, unsustainable agriculture and illegal wildlife trading.
'My gap year is over': Greta Thunberg heads back to school
Updated communications on the EU Green Deal proposal appear to provide wiggle-room for some fossil fuels.
Should Paris pull the plug on heating outdoor terraces?
A bid to build a third runway at London's Heathrow Airport has been declared unlawful over climate change.
The European Commission has unveiled the "Just Transition Fund" as an essential part of its ambitious programme to fight climate change. The Fund, worth 7.5 billion euros, should help countries kick their coal habit.