 
 <prompt> Wetin be di difference for temperature across di world? Based on di last question, write a context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: The climate for Cretaceous dey less certain and dey cause argument. Dem believe say higher levels of carbon dioxide for atmosphere dey cause world temperature to be almost the same everywhere: temperatures for di whole planet dey almost equal. Average temperatures sef dey higher pass today by about 10°C. For middle Cretaceous, ocean waters for equator (wey fit reach 20 °C for deep ocean) fit don dey too hot for sea life, and land areas wey dey near equator fit don dey desert even though dem dey close to water. Oxygen circulation for deep ocean fit don dey disturb too. Because of dis, plenty organic matter wey no fit decompose fit don gather, and later dem go deposit am as "black shale". 