It addresses the most relevant questions of the planet and regarding the planet. Is climate change real? What is the primary cause of climate change? Of course increase in greenhouse gas concentration is the primary cause of it. But that in itself is cause by the kind of system we live in. Our economic policies and individual ape-ish urges is responsible. We must act or we'll drown soon! Don't disregard Hawking who said in a TED talk "I think it quite likely that we are the only civilization within several hundred light years; otherwise we would have heard radio waves. The alternative is that civilizations don't last very long, but destroy themselves."