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The aircraft 
 Airbus has unveiled big 
 for the world's first zero-emission aircraft. The airline giant predicts its hydrogen-powered 
 airplanes could be flying by 2035. The concept is a 
 away from battery power. Many in the industry believe batteries are the 
 for carbon-zero airplanes. Airbus says batteries could be 
 for large airplanes and hydrogen is 
. The company said the 
 to hydrogen would require "decisive action from the 
 aviation ecosystem". This means redesigned airports and refuelling 
.