I will utterly consume all things from off the land, saith the LORD. I will consume man and beast; I will consume the fowls of the heaven, and the fishes of the sea. Zephaniah 1:2-3
(You might not be able to tell just from reading it, but this passage shows God's concern for the environment and his attitude toward poverty and justice. That's why it is highlighted in both the Green Bible and the Poverty and Justice Bible.)
God is going to burn to death every living thing on earth, as he explains in Zephaniah 3:8 (which is also highlighted in the P&J Bible).
All the earth shall be devoured with the fire of my jealousy.
Christians aren't bothered by this, though, since it won't happen until after the Rapture. They'll be in heaven, while everyone and everything else is "devoured with the fire of [God's] jealousy."
So it all works out fine in the end. God's justice, concern for the environment, and his love for humanity will be clearly shown when he burns everyone and everything on earth (except the Bible-believers, of course).
That is why believers have been saying for nearly 2000 years, and still say today, "Come Lord Jesus!" They are looking forward to the day and the hour that Harold Camping tried to predict.
(Mr. Camping has a new date, by the way -- October 21, 2011.)