 
 <prompt> Higher levels of CO2 dey lead to two tins, world temperature gradient north to south dey flat, and? Given the previous question, write a context wey contain the answer. E fit be 1 - 20 sentences. Context: <response>: ```Di climate of di Cretaceous dey less certain and dey more widely disputed. Higher levels of carbon dioxide for di atmosphere dey make pipo believe say di world temperature gradient from north to south don almost flat: temperatures dey almost di same across di planet. Average temperatures sef dey higher pass today by about 10°C. For fact, by di middle Cretaceous, equatorial ocean waters (maybe as warm as 20 °C for di deep ocean) fit don dey too warm for sea life,[dubious – discuss][citation needed] and land areas wey dey near di equator fit don dey deserts despite say dem dey close to water. Di circulation of oxygen to di deep ocean fit don dey disrupted.[dubious – discuss] For dis reason, large volumes of organic matter wey no fit decompose fit don accumulate, and e go eventually dey deposited as "black shale".``` 