For many decades, the coca plant—the main ingredient in cocaine—has been grown almost exclusively in South America. But a new study shows that nearly half of northern Central America appears to be highly suitable for cultivating this lucrative cash crop. For many decades, the coca plant—the main ingredient in cocaine—has been grown almost exclusively in South America. But a new study shows that nearly half of northern Central America appears to be highly suitable for cultivating this lucrative cash crop. Environment Phys.org – latest science and technology news stories