10 things we learned about Earth since the last Earth Day

The secret to wombat poop, how skies turn orange, and what a cold ocean blob could mean for the climate.

This time last April, on the 50th anniversary of Earth Day, the world was coming to grips with the isolation of quarantine and the economic and travel slowdowns that defined the first wave of the Covid-19 pandemic. Even now, with the rollout of vaccines, the virus continues to affect our daily lives. And the toll keeps growing: 3 million dead and more than 140 million cases worldwide.

If anything, the...