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Climate change is real.

Nothing, not even our own minds, are real -- we are living in a simulation. I believe that RationalWiki does a good job of explaining the gist of the argument, since I can't explain it any more briefly with such small character amounts allotted: The ability to simulate: Although human-level minds we are currently familiar with are all implemented by biological brains, there is no reason in principle why a human-level mind might not be implemented by other means, such as a computer with artificial intelligence. How to simulate: One possible method for achieving this level of artificial intelligence, at least in principle, is to simulate the operation of the human brain on a computer so that it is indistinguishable from human intelligence (see Turing test). If the human mind is ultimately material, and there is no immaterial soul needed to explain the human mind, this assumption would seem to be correct. Simulation of people and environment: So, it should be possible, with enough computing power, to simulate many human-level minds (even billions of them), complete with a virtual reality environment for them to inhabit and interact with each other in. These simulated people need have no idea they are being simulated. Computational power: Although the level of computational power needed to achieve the above is far beyond our present capabilities, it is not inconceivable that one day (possibly centuries from now) we will achieve the necessary capabilities to do so Multiple simulations: If we had the power to create such simulations, it is likely we would use it, and use it extensively, creating many such simulations. More simulated entities than real entities: Hence, the number of simulations (millions or billions) will far exceed the number of actual non-simulated worlds (one only) Concluding that we are a simulation: Therefore, almost certainly, we are not actually in the real non-simulated world, but unbeknown to us in one of these simulations.