Want a climate-friendly flight? It's going to take a while and cost you more

Airlines are facing increasing pressure to cut their climate-changing emissions. That made sustainable aviation fuel a hot topic this week at the Paris Air Show, a major industry event. Sustainable fuel made from food waste or plant material is aviation's best hope for reducing emissions in the next couple of decades. The industry is counting on sustainable fuel to contribute heavily to its goal of reaching net zero carbon emissions by 2050. But critics say airlines are greenwashing by taking credit for an alternative fuel that barely exists today. Because sustainable fuel costs more and is in low supply, plane tickets are likely to creep up in price, too.