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Earth has been warming since the last ice age and I suppose a "worse case scenario" is we will enter another Pliocene era. I put quotes around worse case scenario because that is subjective and in reality there is nothing worse about it just different. Earth has been much warmer before and flourished so all this scary talk about earth getting warmer is not scary at all to anyone who can see the big picture. The climate changes dramatically and it does so often. It's kind of like been there done that, yawn.
"The global average temperature in the mid-Pliocene (3.3–3 mya) was 2–3 °C higher than today,[SUP][7][/SUP] global sea level 25 m higher[SUP][8][/SUP] and the Northern hemisphere ice sheet was ephemeral before the onset of extensive glaciation over Greenland that occurred in the late Pliocene around 3 Ma.[SUP][9][/SUP] The formation of an Arctic ice cap is signaled by an abrupt shift in oxygen isotope ratios and ice-rafted cobbles in the North Atlantic and North Pacific ocean beds.[SUP][10][/SUP] Mid-latitude glaciation was probably underway before the end of the epoch. The global cooling that occurred during the Pliocene may have spurred on the disappearance of forests and the spread of grasslands and savannas."[SUP][/SUP]
"The global average temperature in the mid-Pliocene (3.3–3 mya) was 2–3 °C higher than today,[SUP][7][/SUP] global sea level 25 m higher[SUP][8][/SUP] and the Northern hemisphere ice sheet was ephemeral before the onset of extensive glaciation over Greenland that occurred in the late Pliocene around 3 Ma.[SUP][9][/SUP] The formation of an Arctic ice cap is signaled by an abrupt shift in oxygen isotope ratios and ice-rafted cobbles in the North Atlantic and North Pacific ocean beds.[SUP][10][/SUP] Mid-latitude glaciation was probably underway before the end of the epoch. The global cooling that occurred during the Pliocene may have spurred on the disappearance of forests and the spread of grasslands and savannas."[SUP][/SUP]