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Israel has announced that it has begun a ground operation in southern Gaza - an area it had previously designated as a safe zone; we look at the potential humanitarian consequences of the extended fighting.

Our correspondent reports from Ukraine, where a soldier participating in an operation on the Dnipro river has described the situation as 鈥渉ell鈥�, with no clear objective.

And from the COP28 climate summit, we look at the threat to protected environments around the world as a new report says many are threatened by the expansion of fossil fuel exploration.