What do you Think are some positive and negative impacts of Columbus' exploration on the New and Old World?

You people drive me crazy!! Which is good for you is bad for me or vice-versa si doesn't exists good or bad. Certainly it was bad for the Indians cause they was decimated but it was good for Europeans. European empires got a lot of gold which had a good impact on their economy. In after years European poor's and exiled Europeans went to the New World where they got properties. So it was good for Europeans and was a disaster for Indians.