Hello, I'm Celia Hatton and welcome to NewsHour from the BBC World Service.
I'm coming to you live from central London.
In today's program,
we'll be going back in time for a fresh look at the vast network of roads built by the Romans.
And then we'll go into the nearest future when Elon Musk's Tesla robots could be put to work in ordinary homes.
More on those stories coming up a little later.
But first, let's focus on the present and what's happening now in Brazil.
This year's climate summit is happening there.
A lot of coverage so far has focused on the leaders from wealthy industrialized countries that are at the meeting,
including the UK, France and Ireland.
And a lot has been said about the leaders from other major states who aren't there.
from the US, China, India, big emitters of greenhouse gases who've decided to skip COP.
But what about countries that are much, much smaller than that?
Countries in places that could be swallowed up by rising sea levels.
Is it really worth it for them to take part in the COP process?
The Pacific Island nation of Palau is one of those smaller countries.
It's made up of 340 low-lying coral and volcanic islands, and it's home to just 17,000 people.
I spoke with Palau's president, Sirangul Samuel Whipps.
He's in Brazil.
And I asked him to explain what's at stake for his country.