I do not discount that a lot of us are here to grow and mature.  That is the reason why we are here, after all.  Some equate living on Earth as a kindergarten.  In fact, we are all attending a Master's degree course at one of the toughest universities when we come to Earth.  The reason for the destruction of our planet is of course profit.  The reason why many of us are not worried about the state of the Earth is because we have given up our own power to govern ourself; we gave that away to government.  Once this governance comes back to each of us individually, many of us will work towards the preservation and improved health of our planet.  The Earth has been around for billions and billions of years.  It will re-correct its ecosystems with or without our help, long after we are gone, if that is the outcome. 

George Carlin has a great comedy bit on this ideal, which I share his sentiments exactly:  https://www.youtube.com/watch?v=7W33HRc1A6c