noun
Earth Hour
A worldwide environmental event where people turn off non-essential lights for one hour, typically from 8:30 to 9:30 p.m. local time on the last Saturday of March.
今年のアースアワーには、世界中の多くの都市が参加した。
Many cities around the world participated in this year's Earth Hour.
アースアワーの間、私
During Earth Hour, we spent time by candlelight.