A NASA-led mission is set to take off the California coast.
It will carry an international satellite which will conduct an unprecedented survey of the world's oceans, lakes and rivers for the first time.
That data could provide vital clues about the climate crisis.
Al Jazeera's Rob Reynolds reports from Los Angeles.

Subscribe to our channel http://bit.ly/AJSubscribe
Follow us on Twitter https://twitter.com/AJEnglish
Find us on Facebook https://www.facebook.com/aljazeera
Check our website: http://www.aljazeera.com/
Check out our Instagram page: https://www.instagram.com/aljazeeraenglish/

@AljazeeraEnglish
#Aljazeeraenglish
#News