Climate activists descended upon Amazon's Seattle headquarters to push the online retail giant to use boxships that are free of carbon emissions by 2030.

A dozen members of Ship It Zero Coalition, led by environmental groups and Pacific Environment, marched into the lobby on Tuesday with a mock shipping container emblazoned with the words "Abandon Dirty Ships!".

The group, clad in blue "Ship It Zero by 2030" t-shirts and white sailor hats, then pulled a very long petition scroll signed by 20,000 people in support of zero-carbon shipping.