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Hi Grady, you have a point but so does everyone else. I think while the earth is in a stable zone it would be expected that it will find a way of correcting itself, we may not exist after that but it could happen.
Stephen Hawkin's also said that we will not expect to survive on this earth in the long term and we need to develop space travel to move when it gets out of control. Need confirm that or whether he has changed his mind.
I think we need to find sustainable planets before intelligent life but why not both. Communication may come in different forms but as it needs to travel accross space it can only be done but electromagnetic radiation including light.
I think if we can determin that life exist on other planets and able to detect their communication then we would also be able to decifer and determin whether they are agressive as well.
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