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Some 190 nations now say they will cut out coal - which could make a major contribution to the fight against climate change. But several of the biggest users are not signing up - so how big a step forward is it? We'll get an expert view.

We'll hear about a caravan of migrants travelling through Mexico, many of them believed to be sick - part of what is being described as a migrant crisis in the country.

And our correspondent looks back on the summer fires in Greece and asks if the country is doing enough to prepare for mega-blazes.