This question needs to be moved to a Discussion Forum, where I'm sure it will generate a healthy debate. The only question is whether it is more appropriately placed under Science or Social Sciences.
In many ways, humanity is threatening the continued existence of planeet Earth. Pollution is fouling the air we breathe and the water we need in order to live. Climate changes and global warming are real and are going to have increasingly dramatic impacts on the lifestyles of peoples in areas affected by rising water, lengthening periods of drought, and more severe extremes in weather disturbances. An exploding global population is straining resources to produce food and to transport it from areas of production to areas of need.
As a Christian and an optimist, I am not ready to begin planning the Earth's funeral at this time. I pray that we will all wake up and join in the search for better ways to care for this precious world, to find alternatives that won't continue to consume resources that can't be replaced, and to develop attitudes and practices that will allow coming generations to have, if not the same world we have now, at least one that will support life with some degree of comfort and health.