Cassandra Mingled into Modern Dilemmas...

I doubt many of us have been to Alaska. Personally, I have not either, but I have wondered for a while what life is like. One thing I never pondered until now was how bad the weather is there. No, I do not mean "it's always snowing insanely"- In fact, the problem is quite the opposite. Our problem lies in the melting of the ice and glaciers. Our problem lies in sea-levels rising. Our problem lies in the decaying of natural elements. Our largest problem, however, lies with very few listening to the signs. What is the history behind this? Has this always been an issue?
Cassandra was a Greek Prophet who first put a name on this issue: The issue of people not listening to signs, people not listening to people, and people not doing anything about it. Cassandra could see far into the future and attempted to help others in this way. Seemingly, she was not very helpful. She spoke in riddles, such as "what appears to be a hunting net is used for catching men." She did not explain the signs and demanded too much of people. When she warned the Trojans she spoke in riddles such as this "what a seed is, is not a seed, but a stone" - meaning the horse was not a gift, but a token of their downfall. The Trojans did not listen to her. Instead, they took the horse in and regretted it later.
From that, people learned that to be heard, one must speak clearly. But if people are being perfectly clear, how come the warning still does not come across? In 1986 a spacecraft exploded, killing the person inside. Did anyone know? Yes. Engineers noticed an error in the system days before the launch. The managers ignored them. However, when Andrew Natsios asked President Bush to help conflicts in Sudan be stopped before they arose, he agreed. One of the problems for Cassandra and the engineers was that no one understood their fear. Though they could clearly tell there would be an issue, they were too "far ahead" for anyone to feel connected to what they were explaining.
So to be a successful Cassandra one must:
1. Speak clearly, and make sure that their point gets through
2. Show as well as tell: give reasons for your concern
3. Explain this thoroughly, knowing that others may not have been aware of this
Natsios was successful because he thought of these things, and gave a detailed presentation explaining why to the president. As well as this, there were clear signs in Sudan that the situation was going to get much worse, but it took a Cassandra to show that.
With all of this, many modern Cassandras are still being ignored. Even Mother Nature is a Cassandra. She speaks clearly. She shows us fires and sea-levels rising, ice melting. Though many things could have caused those individually, only one thing causes them all. Climate Change. And with her, and people's warnings, nothing is being done. Leaders are ignoring this.
 So why are only some warnings heard? Is it because people truly don't believe these signs of danger? Or is it that a human's mind has a filter, and refuses to take notice of anything they do not want to hear?