If our hope is in finding an exoplanet like earth, we are the most miserable of creatures. All other species that live on earth are balanced with their environment except rich people. By rich people I mean those who live in first-world nations. We have become afraid of what is in the future. Nuclear weapons have made us afraid of each other because we don't trust any other nation that has them. The international policy of MAD (mutually assured destruction) has brought a stalemate to world peace. We look for planets like earth hoping to find peace there, but they may be so far away it would take centuries of travel. I believe the only hope is in a new heaven and a new earth. God says He will do this, but only if we believe Him.