From the Best of What On Earth – They can be noisy. And smelly. And, as Cate Blanchett (yes, Cate Blanchett!) complains, don’t they just move “leaves from one place to another, only for them to be blown back again"? Gas-powered leaf blowers create a lot of opinions and a lot of emissions. Molly Segal takes us through why they're so particularly polluting and unhealthy. And, she explores the solutions underway — from political bans to incentives for switching to electric.