Sufficiently significant to affect the whole world.(adjective)
Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)
Use "earth-shaking" in a sentence
"Have you heard about the earth-shaking new study "proving" that addicts inherit a brain dysfunction that causes them to have poor impulse control?"
"They talked about raising the Medicare eligibility age and reducing the annual cost-of-living adjustments in Social Security to save money—both earth-shaking propositions in the party."
"The citizen rebellions in the Middle East have been dramatic, earth-shaking, undreamt of before they occurred - and they have had no discernible effect on the production and shipment of oil, which haven't slowed down any."