In the past few years, most major airlines have announced their plans to use commercial electricairplanes. Travelers can soon travel to different places via an electric aircraft. Take United Airlines forexample. They will offer fossil fuel-free domestic flights by 2026. In addition, Sweden and Denmark alsodeclared their plans to use fossil fuel-free electric-powered airplanes by 2030. Electric air travel (i.e.traveling with an electric-powered aircraft) is going mainstream. There are various methods to supplyelectricity; however, the most common way is to use batteries.         The climate crisis has been worsening these past few years. One of the major contributors to thisenvironmental problem is air transportation. The aviation sector has released huge amounts of carbondioxide (CO2) into the atmosphere every year. Unfortunately, airplanes are predicted to triple their CO2emissions by 2050 if left unchecked now.       Most major airlines have thus signed up to meet the targeted net-zero carbon emissions by 2050.Governments from many different countries are establishing policies to help protect the environment.Austria and France have enacted bans on short-haul domestic flights. In the United States of America, thegovernment is also pushing to reduce CO2 emissions through clean-energy transportation.      As presented, the use of small electric airplanes is the first step towards greener air travel. Thedevelopment of larger electric planes may take several years. Still, you can expect to hear that electric airtravel will be going mainstream in the coming years.
【題組】71 What is the main idea of the passage?
(A) As science develops, views of travel do not change.
(B) Traveling with an electric-powered aircraft is going mainstream.
(C) It does not suggest a different solution to a problem.
(D) The climate crisis has been worsening these past few years.