Sup,
Erase one horrible tragedy from history can be anything bad. For example 9/11. You could erase it like it never happened and nobody lost anybody that day.(messing with time though would be unpredictable)
Also, global warming is controversial to some people. But I'm assuming most of you believe that it's not. Most people in the world agree with the global warming thing. So for that one, you can prevent global warmer by reversing the negative effects.
Hope you guys enjoy the WYR. New WYR [u]every[b] Wednesday[/b][/u]. Peace.
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Erase one horrible tragedy, easy. Probably not what most people would think, though. I'd go back and reverse the decision to defund the SSC (Superconducting Super Collider) back in 1993. This thing was supposed to be MASSIVE. The LHC in Europe is 27 km long while the SSC would have been 87 km long. We could have learned a lot more by now if that had actually gone through.