The earth will not be destroyed - it was made to stand to time indefinite (Eccl 1:4). However, the wickedness is what will be destroyed. A few of the sign that are presence we see in people and their disposition - read 2 Timothy 3:1-5.
Some of the signs in respects to what will be happening globally - Matthew 24:6-14; Luke 21:11; Matthew 24:14.
Other side will be the fall of religion and the government; no unity among government which we see taking place now. People reject the tyranny of the government. This is spoken of in Daniel - however, you must understand it symbolic term.
Man ruining the earth - which in turn will cause Almighty God to ruin him (Revelation 11:18)
The apostle Paul warned that the last days would bring a marked increase in false teaching. "The Spirit clearly says that in later times some will abandon the faith and follow deceiving spirits and things taught by demons" (1 Timothy 4:1). The last days are described as "perilous times" because of the increasingly evil character of man and people who actively "resist the truth" (2 Timothy 3:1-9; see also 2 Thessalonians 2:3). Read more: http://www.gotquestions.org/signs-end-times.html#ixzz2aUH0vLEN
No need for tinfoil hats, guys. Anyways, the end of the world and Jesus' second coming is written that it's supposed to happen within a time that nobody expects it. Not even the angels in Heaven, nor the demons in Hell, nor Satan, nor Jesus Himself. Only God the Father knows. It's impossible for anyone to predict it. It could happen in exactly five minutes, or it could happen in three thousand years. All we can really do is stay faithful.
" Jesus told them, "Don't let anyone fool you. For many will come claiming to be the Messiah, and will lead many astray. When you hear of wars beginning, this does not signal my return; these must come, but the end is not yet. The nations and kingdoms of the earth will rise against each other and there will be famines and earthquakes in many places. But all this will be only the beginning of the horrors to come. Then you will be tortured and killed and hated all over the world because you are mine, and many of you will fall back into sin and betray and hate each other. And many false prophets will appear and lead many astray. Sin will be rampant everywhere and will cool the love many. But those enduring to the end shall be saved. And the Good News about the Kingdom will be preached throughout the whole world, so that all nations will hear it, and then, finally, the end will come." ( Matthew 24:4-14) Living Bible. The Bible describes events and conditions that mark this significant time period, " The sign". Is a composite one made up of many evidences. Answer for the person that asked question, a lot of what the bible is saying is happening now. " The unspiritual man does not receive the gifts of the spirit of God, for they are folly to him, and he is not able to understand them because they are spiritually discerned." ( 1 Corinthians 2:14). Revised Standard Bible