"For me, the really concerning aspect of this, is that now, more than at any time in our history, our species needs to work together. We face awesome environmental challenges. Climate change, food production, overpopulation, the decimation of other species, epidemic disease, acidification of the oceans. Together, they are a reminder that we are at the most dangerous moment in the development of humanity. We now have the technology to destroy the planet on which we live, but have not yet developed the ability to escape it. Perhaps in a few hundred years, we will have established human colonies amidst the stars, but right now we only have one planet, and we need to work together to protect it. To do that, we need to break down not build up barriers within and between nations." - STEPHEN HAWKING