​"There are people who write in newspapers that all the technology is available to do that, and it's just a matter of implementing, and I don't believe that is the whole story," Yuri Sebregts, Shell's chief technology officer, told ET in an interview. Electrifying personal mobility is "proven and fully possible" and it is "only a matter of turning over the world's vehicle stock", he said. But, decarbonising airplanes or ships or industrial energy is not easy, he added.