How Would the Climate Be Affected If All Fossil Fuel Use Discontinued Would Sea Level Lower Deserts Turn Green?

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Considering that the use of fossil fuels for energy is supposedly causing verdant land to turn to desert and the sea level to rise, how much less fossil fuel use would cause the sea level to recede and deserts to become green, shouldn’t the global warming alarmists bent on upturning the economy be able to tell us this since the opposite is causing what purportedly is happening to the hydrologic logic?