Climate change will hit Earth in a big way some day in the future when the Sun engulfs the Earth.
In fact, over it's 4.5 billion years of life the Sun has changed already and would have had dramatic effect on Earth's climate over this time.
The Sun has another 5 billion years to go. But in about 1 billion years it will already have made the Earth too hot to live on. Human's have less than 1 billion years to find a new planet. :)
The Star Trek future will happen. Too bad I won't be around to see it.
