This links to why we are alone is a good post


If we use radio waves to contact another race this means that they must use radio waves also, we have been beaming out UHF , Radio, microwave and other signals now. For the last 50 years our strong radio has beamed into space, if aliens can get this signal and understand it what are the chaces that aliens will be more advanced. I say 98% chance because we've been doing this for only a few decades. Life in space seems like a wonderful subject but think about it, if aliens knew we are here why would they want to contact a primitive race, we destroy the rainforest, pollute the earth, kill each other with anthrax, make other clever lifeforms like Whales Birds into paths of extinction,

Mankind has done some wonderful things and made many things happen, but we have also done very bad things, this is what we have done which is not noble or wonderful


If aliens knew humans were here, Would aliens want to contact such a race, a race which has made wars? A people which puts toxins in the sea, the humans which cut down the tress, we the human race have used atomic weapons on our own people...