Ask the search engine Ecosia about “Paris to Prague” and flight booking websites dominate the results. Ecosia’s CEO Christian Kroll would prefer to present more train options, which he considers better for the environment. But because its results are licensed from Google and Microsoft’s Bing, Ecosia has little control over what’s shown. Kroll is ready for that to change.Berlin-based Ecosia, which donates its profits to tree planting, and its Paris-based competitor Qwant are announcing Tuesday th...