Planes are hard to fully electrify. Heavy batteries and range limitations pose severe problems. Hybrid versions that use electric batteries and traditional fuel could help make the sector greener while fully electric plans are being developed. Sean Captain joins host Zoe Thomas to discuss. Plus, a recent study found that less than 5% of climate policies in 41 countries actually worked to reduce emissions. We’ll tell you what did work.  Sign up for the WSJ's free Technology newsletter.  Learn more about your ad choices. Visit megaphone.fm/adchoices