The relocation of the UN meeting meant complications for Greta Thunberg, who wrote in social media and asked for help to get back to Europe - and received answers.

On Twitter, Thunberg now writes that she has been offered to be pushed from Virginia in the US over the sea:

"I'm so happy to say that hopefully I will make it to COP25 in Madrid."

With her on board, she has two Australian Youtube filmmakers and a British sailor.

Greta Thunberg aboard the catamaran she hopes will catch her in Madrid in time for the COP25 climate meeting. Photo: Ben Finley / AP / TT