The Spanish government says it is willing to help teen environmental activist Greta Thunberg cross the Atlantic Ocean in time to attend a United Nations climate conference in Madrid after it was relocated from Chile.

But the clock is ticking. Thunberg, who is currently in Los Angeles, needs to find a way to make it in time for the December 2 start of the COP25 conference in the Spanish capital by traveling through carbon-free modes of transportation.

It is uncertain how Spain would arrange a 6,000-mile carbon-free trip for Thunberg given her current location.

‘Dear Greta, it would be great to have you here in Madrid,’ Teresa Ribera, Spain’s Ecological Transition Minister, said on Twitter on Saturday.

‘You've made a long journey and help all of us to raise concern, open minds and enhance action.

‘We would love to help you to cross the Atlantic back.’

Teresa Ribera (left), Spain’s Ecological Transition Minister, says her government is willing to help 16-year-old environmental activist Greta Thunberg (seen right in Los Angeles on Friday) get to Madrid in time for a United Nations climate conference next month

‘Dear Greta, it would be great to have you here in Madrid,’ Ribera said on Twitter on Saturday. ‘You've made a long journey and help all of us to raise concern, open minds and enhance action. We would love to help you to cross the Atlantic back.’

Spain’s Prime Minister, Pedro Sanchez, suggested his capital city host the UN’s COP25 conference aimed at reducing global carbon emissions and combating climate change.

The event was initially scheduled to be held in Santiago between December 2 and 13.

But Chile has been paralyzed for weeks by massive protests that were sparked by a proposed 3 per cent hike in subway fares.

At least 18 people have died and more than 7,000 have been arrested as millions have poured into the streets demanding the government address economic inequality.

The Swedish climate activist tweeted that the conference's relocation from Santiago, Chile, to Madrid has essentially left her stranded in Los Angeles

Thunberg was planning to make a carbon-neutral trip traversing the Western Hemisphere in order to get to the conference in Santiago, which was to be held from December 2 - 13

The massive demonstrations, which have been marred by cases of arson and vandalism, forced the Chilean government to withdraw as hosts of the climate conference.

Thunberg, the Swedish 16-year-old who has gained worldwide fame for sparking a youth movement that is urging global action on climate change, traveled to the United States by sailing on a carbon-free yacht across the Atlantic.

The voyage on the zero-emissions yacht which began in Plymouth, England, took about two weeks.

After attending the UN Climate Action Summit in New York in September, she traveled to Los Angeles in an electric car.

Thunberg had planned to travel from Los Angeles by land across Central and South America in order to attend the conference in Santiago.

Thunberg traveled to the United States by making a two-week voyage across the Atlantic Ocean on a zero-emissions yacht. She is seen above watching a dolphin as the racing boat Malizia II sails in the middle of the Atlantic on August 14

But now that the venue of COP25 has changed, the teen, who has vowed to only get around by carbon-free modes of transportation, tweeted that she is essentially stranded in North America.

‘As #COP25 has officially been moved from Santiago to Madrid I’ll need some help,’ Thunberg tweeted.

‘It turns out I’ve traveled half around the world, the wrong way:)...

‘Now I need to find a way to cross the Atlantic in November... If anyone could help me find transport I would be so grateful.’

In another tweet, she wrote: ‘I’m so sorry I’ll not be able to visit South and Central America this time, I was so looking forward to this.

‘But this is of course not about me, my experiences or where I wish to travel.

‘We’re in a climate and ecological emergency. I send my support to the people in Chile.’

People gather for an anti-government protest in Santiago, Chile, Friday, November 1. Groups of Chileans continued to demonstrate as government and opposition leaders debate the response to nearly two weeks of protests that have paralyzed much of the capital and forced the cancellation of two major international summits

She also tweeted: ‘This of course no problem.

‘People are suffering all around the world, and I’m fine whatever I do and wherever I am.’

The distance between Los Angeles and Madrid is 5,814 miles.

Presumably, Thunberg would need to make another cross-country trek back to the East Coast and then take another vessel which would set sail for the Spanish coast.