Rule reminder
Cohesion and coherence are related but distinct concepts. COHESION refers to the linguistic devices that link sentences: pronouns, connectives, synonyms, ellipsis. COHERENCE refers to the logical and conceptual unity of a text — whether ideas connect meaningfully. A text can be cohesive but incoherent, or coherent but lacking explicit cohesive markers.
A text about climate change suddenly includes two sentences about cooking pasta. Which problem is this?