The Guardian view on the Sahel and its crises: the west can still make a difference

Two apparently separate developments in the Sahel are linked by more than geography. Last week, the US confirmed that it will withdraw more than 1,000 troops from Niger after the military junta revoked a security pact - just six years after a new $110m military base opened. Meanwhile, a record heatwave is the latest deadly extreme weather event. The US had hoped to maintain the military agreement despite last summer's coup, part of a wave of military power grabs across the central Sahel and the wider region. French troops had already been expelled, with France earlier withdrawing from Mali and…