1. Neil deGrasse Tyson
April 22, 2016: Earth Day is graced with a Full Moon. Occurs, on average, every thirty years.
2. Pharrell Williams
We call it Planet Earth, but it could have been called Planet Ocean. No blue, no green. Happy #Earthday
3. Jeff Bridges
This #EarthDay, lets begin to make personal changes that really reflect the direction our planet needs to take.
4. Tony Goldwyn
Take a hike with someone you love on this #EarthDay
5. Connie Britton
Earth day y’all! Today world leaders sign #ParisAgreement & pledge urgent #ClimateAction. Spread the word!
6. Mark Ruffalo
#TroubleInTheWater is now! thx @Common & @MalikYusef for a powerful video, https://t.co/4GFW4Tj4K5 to watch & sign #Flint petition #Earthday
7. Leonardo DiCaprio
Today marks a historic moment as 160+ leaders gather to sign the #ParisAgreement. Watch live: https://t.co/OIurubDkQL #EarthDay
8. Bill Nye
Happy Earth Day. This is a pivotal year for our spaceship planet. Vote with the environment in mind.
9. Bear Grylls
Today we celebrate #EarthDay and raising awareness for all the great endeavour of charities such as @Tusktrust. Let's fight for this planet!
10. Katie Couric
The story behind #EarthDay! 🌎🌳🌴🌺🌸🌹https://t.co/VF1KwPzmqp
11. Maroon 5
For Earth Day our friend Adam Gardner of @reverbrocks & @guster talks w/ @billmckibben about music & the environment https://t.co/wTus2ulr6N
12. Hillary Clinton
To make a better future for our kids, we've got to protect the future of our planet. Happy Earth Day.
13. Holly Marie Combs
Heading to The Grove to plant a new tree with @TreePeople_org in honor of #EarthDay Come celebrate with me. #EarthDay2016
14. Sara Ramirez
#Love the Earth and #Love each other #EarthDay
15. Adrian Grenier
Let's celebrate this historic day together. Watch live as 160+ world leaders sign the #ParisAgreement https://t.co/dAXW4fpMBW #EarthDay
16. Mario Batali
dear twitterverse, please save an ugly fruit or vegetable in your market today!! #saveuglyfood #earthday https://t.co/MHkTeNl8cY
17. Paul Wesley
If honeyees aren't healthy, our earth isn't either. This #EarthDay I teamed up with @burtsbees to Tweet B-less and help #BringBackTheBees.
18. Ben Affleck
Sustainability is possible, let’s protect this beautiful Earth. @easterncongo #EarthDay
19. Bette Midler
It's Earth Day. I am going out with my trusty pincers and bag to pick up some plastic that befouls our beautiful planet. Care to join me??