What were the two most important results of the european voyages to the americas?

The major impacts of the European voyages to the Americas were the establishment of trading settlements or colonies, the reaping of new raw materials, the establishment of new trade routes, resettlement of Europeans to the Americas, and continued exploration for sea routes to India and Asia. Any of these reasons could be boiled down to the "two" most important results, however there were many subsequent results. 

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”