One that travels back in time runs the risk of destroying their own existence which causes in turn them not destroying their own existence. I simply cannot believe this is possible since accepting time travel will in turn mean accepting something like the grandfather paradox can happen....

Global warming has occurred in the past hundred years. This warming occurred mostly in the first half of the 20th century, counter to the period when there was more co2. Correlation between sunspot activity and temperatures are higher than co2 and temperature....

The idea that a tree falling and making a noise without their being any way to prove this event happened is purely speculative. http://en.wikipedia.org/wiki/If_a_tree_falls...

An atheist does not need to believe that something came from nothing. Character Limits.........................

I think anyone who supports this viewpoint needs to retake elementary school math. I don't mean to sound rude about it but it I think that it quite obvious that 1 + 2 = 3 and NOT 12. Allow me to demonstrate. Say you have 2 apples. Now imagine that I give you one more apple. How many apples do you have? Three apples. There is no possible way that you could have 12 apples unless I somehow had the ability to create 10 additional applies out of thin air. Anyway, I think that example alon...

I think stem cell research is a good thing and should continue. I will wait for my opponents before making my first argument. R1 will be declaring of your position. R2 will be for opening statements. R3 and R4 will be for rebuttals. R5 will be for concluding statements. I would like to thank my opponent and wish them good luck. -Kat...

I don't even need to go in detail about this one. If you look outside and look up into the sky, you will see what I mean. There is no possible way that the sky could be any other color than blue (except maybe at night when it is dark outside or white if you count the clouds)....

Wind energy is the best available energy because it will never run out. All other energy's will either run out or are way to expensive to start up and keep running. Some other energy's are bad for the environment and will make the world a worse place than it is and will be with using fossil fuels. Also, some people are too busy with work and handling kids that they don't have time to try to make a difference in the world and change what energy sources we are using most frequently....

I challenge anyone to give the the name of "one" let alone a 100 scientist who will put their reputations on the line and state categorically that "global warming" is caused by man. I fully expect samantics will be the only rebuttal to this question in order to avoid answering the substance of the question....

There is clear evidence that the world is warming. There is no reason to believe it won't continue warming. This will be disastrous for many people and other species in the world. Therefore it is hypocritical and unethical not to act against it....