For a brief period tonight, some parts of the world will go dark. It's Earth Hour - CNN

1. For a brief period tonight, some parts of the world will go dark. It's Earth Hour  CNN
2. Earth Hour 2019: Why You Should Turn Your Lights Off, and When to Do It  Newsweek
3. Earth Hour 2019: Lights around the world are turning off for Earth Hour to help save the planet today  CBS News
4. Earth Hour: landmarks to switch off lights to help save planet  The Guardian
5. Downtown Chicago lights getting turned down for Earth Hour, bird migration  Chicago Tribune
6. View full coverage on Google News