What are we trying to accomplish by exploring space?

If you haven't noticed, we are getting a little overcrowded here. We are using more and more of everything. Fresh clean water, fresh clean air, too much CO2 is being dumped in the air, food production is hurting, the garbage dumps are being overfilled, the population of humans is through the roof (I lost track, 3billion 4billion??), people are getting on each other's nerves, wars, wars and more wars. We need new and fresh real estate. We need more resources. All this to continue on as human beings.