Seven trumpets - 1st

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Revelation 8:7 (New International Version)

 7The first angel sounded his trumpet, and there came hail and fire mixed with blood, and it was hurled down upon the earth.
A third of the earth was burned up, a third of the trees were burned up, and all the green grass was burned up.

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Earth is ~2/3 water. So 1/3 would of the earth would be referring to all the land.
The phenomenon that this seems to refer to is -- Global Warming

http://www.enotes.com/geology/q-and-a/how-much-percent-earth-land-how-much-water-46469

29% land, 71% water

http://www.noaa.gov/ocean.html - http://www.mos.org/oceans/planet/index.html

Human "Footprint" Seen on 83 Percent of Earth's Land (NatGeo)

Global Warming
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