The target to reach “net zero” emissions — a point in which air travel is no longer pumping any additional carbon dioxide into the atmosphere — would require the aviation industry to significantly step up its climate efforts.That puts the onus on the world’s richest countries, which account for the bulk of global air travel.“To build room for poorer countries to grow their aviation sectors, richer countries will need to peak emissions even faster,” said Dan Rutherford, director of the think tank’s aviation and marine programs.Those talks quickly became a microcosm of the politics involved in global climate negotiations, with less wealthy nations arguing that they should not face the same restrictions as richer nations.Aviation’s contribution to climate change has been thrust into the spotlight in recent years by climate activists like Greta Thunberg, the Swedish environmentalist who inspired a worldwide no-fly campaign."