The details of a new visa enabling Tuvaluan citizens to permanently migrate to Australia were released this week.

The visa was created as part of a bilateral treaty Australia and Tuvalu signed in late 2023, which aims to protect the two countries' shared interests in security, prosperity and stability, especially given the "existential threat posed by climate change".

The Australia-Tuvalu Falepili Union, as it is known, is the world's first bilateral agreement to create a special visa like this in the context of climate change.

Here's what we know so far about why this special visa exists and how it will work.

The impacts of climate change are already contributing to displacement and migration around the world.

As a low-lying atoll nation, Tuvalu is particularly exposed to rising sea levels, storm surges and coastal erosion.

As Pacific leaders declared in a world-first regional framework on climate mobility in 2023, rights-based migration can "help people to move safely and on their own terms in the context of climate change."

And enhanced migration opportunities have clearly made a huge difference to development challenges in the Pacific, allowing people to access education and work and send money back home.

As international development expert Professor Stephen Howes put it,

Countries with greater migration opportunities in the Pacific generally do better.

While Australia has a history of labour mobility schemes for Pacific peoples, this won't provide opportunities for everyone.

Despite perennial calls for migration or relocation opportunities in the face of climate change, this is the first Australian visa to respond.

The visa will enable up to 280 people from Tuvalu to move to Australia each year.

On arrival in Australia, visa holders will receive, among other things, immediate access to:

They will also have "freedom for unlimited travel" to and from Australia.

This is rare. Normally, unlimited travel is capped at five years.

According to some experts, these arrangements now mean Tuvalu has the "second closest migration relationship with Australia after New Zealand".

The technical name of the visa is Subclass 192 (Pacific Engagement).

The details of the visa, released this week, reveal some curiosities.

First, it has been incorporated into the existing Pacific Engagement Visa category (subclass 192) rather than designed as a standalone visa.

Presumably, this was a pragmatic decision to expedite its creation and overcome the significant costs of establishing a wholly new visa category.

But unlike the Pacific Engagement Visa - a different, earlier visa, which is contingent on applicants having a job offer in Australia - this new visa is not employment-dependent.

Secondly, the new visa does not specifically mention Tuvalu.

This would make it simpler to extend it to other Pacific countries in the future.

To apply, eligible people must first register their interest for the visa online. Then, they must be selected through a random computer ballot to apply.

The primary applicant must:

People with New Zealand citizenship cannot apply. Nor can anyone whose Tuvaluan citizenship was obtained through investment in the country.

This indicates the underlying humanitarian nature of the visa; people with comparable opportunities in New Zealand or elsewhere are ineligible to apply for it.

Applicants must also satisfy certain health and character requirements.

Strikingly, the visa is open to those "with disabilities, special needs and chronic health conditions". This is often a bar to acquiring an Australian visa.

And the new visa isn't contingent on people showing they face risks from the adverse impacts of climate change and disasters, even though climate change formed the backdrop to the scheme's creation.

With the first visa holders expected to arrive later this year, questions remain about how well supported they will be.

The Explanatory Memorandum to the treaty says:

Australia would provide support for applicants to find work and to the growing Tuvaluan diaspora in Australia to maintain connection to culture and improve settlement outcomes.

That's promising, but it's not yet clear how this will be done.

A heavy burden often falls on diaspora communities to assist newcomers.

For this scheme to work, there must be government investment over the immediate and longer-term to give people the best prospects of thriving.

Drawing on experiences from refugee settlement, and from comparative experiences in New Zealand with respect to Pacific communities, will be instructive.

Extensive and ongoing community consultation is also needed with Tuvalu and with the Tuvalu diaspora in Australia. This includes involving these communities in reviewing the scheme over time.