Earth Day 2018 is focused on a multi-year campaign to end plastic pollution.
These photos are beautiful, but many of these places will cease to exist if we don't reverse course, fast.
More than 150 countries will commit to the pact, which calls for a rapid end to the rise of greenhouse gas emissions.
An early start date would lock a U.S. president into the deal for four years.
HBO series and its special Earth Day episode feature kids talking to kids about the environment.